Be forewarned, do NOT click the theories below unless you want tons of spoilers from the Harry Potter books. These are all just a bunch of theories I've got tumbling around in my head and I'm not sure which of these I've put up and which I've not.
Ok, just remember, I might be repeating myself so bare with me on a few of these.
Severus Snape and James Potter are closely related. This has very little real evidence in the books so far, and is mainly speculation and the way one can take things JKR has wrote. This mainly has a lot to do with Book 5's chapter "The Noble and Most Ancient House of Black" and the imphasis on the family tree. Sirius states that all pure blood wizarding families are somehow related, to keep the blood pure. (*snigger* Incest is best! LOL) As far as we know, James and Snape are both pure wizards. I see no evidence to prove otherwise, seeing as how Snape was a Deatheater and James...well Snape called Lily the mudblood, not James. But the main evidence that points to the blood relations between Snape and James is found in "Snape's Worst memory, and oddly enough, Harry. Snape's been there for Harry several times. At least once a book. His anger towards Harry is the anger he had towards James, it just has no where to go except to the boy who looks just like his father. But he HAS been there for Harry. And in Snape's worse memory, if you pay very close attention to all the Occlumency lessons and the time Harry used the Shield Charm against Snape. Why is it that Snape's worst memories aren't of him as a child, with I assume his father screaming at him mother? Doesn't that seem far more important and terrible memory that the Marauders being a shit to him like always? That little line JKR wrote reaks of possible child abuse or a home where there was spousal abuse. So I think Snape's supposed "worst" memory is what he thought would be some of the worst memories he had that he wouldn't want Harry to see to put him in a worse place than he was already at. Didn't it devastate Harry when he saw what happened in the Pensieve? And as for that memory, why was Snape so important to James? Why, out of all the students at Hogwarts, was Snape so much more important? And James' little comment "It's more that fact he exists." This suggests there's a bit more between Jamie and Sevvie. At least to me. I think that it's possible they are cousins. It would suggest a closeness in relation and how they would somehow know each other better. But as far as that goes, I'm not really sure. And the fact that Snape continues to help Harry and all would suggest there's a loyalty there somewhere....other than James saving Snape's life after Sirius' little stunt.
Albus Dumbledore will die! As I stated to
evilpunkgirl04 yesterday, Dumbledore's time seems very finalized. There's something about Dumbledore that's not been revealed. The fact he knows so much of what goes on at Hogwarts. He knows so much but he never intervenes on any of it. He GAVE Harry the cloak! Come on! He only acts clueless because the less anyone knows about the goings on at Hogwarts, the better. But he knows what the Trio have been up to, which suggests he knew about the Maruaders too. But I also believe that Albus knew that certain things were going to need to happen and chose not to intervene. That and it was prolly the very best thing for Remus to have three friends who could help him with his transformations. But despite all this, now that Harry has become of age, Dumbledore's part in the story seems to become more and more final. He pulls away from the front lines of the story and tries to stop helping Harry as much. It seems cruel when Harry needs all the help he can get but at the same time, the war that is about to happen, ultimately, only Harry can really stop it. I'm curious as to WHY Dumbledore is the only one He ever feared though.
The Maruaders are the unity that the Sorting hat has so severely stressed. Peter is a special case here, but he's a theory all his own. I've been drilling over this like you wouldn't believe but this will make so much sense. Nothing JKR mentions is of little or no importance. If it's in the book, there's something significant about it. The one thing that's yet to be explained is this: Why does Hogwarts have 4 houses when only 2 of the houses has anything to really do with the story? Ok, so 4 Maruaders....4 houses....hmmmm. So this is what I think: Remus = Ravenclaw (go ravenclaw! woo!), Sirius = Slytherin, James = Gryffindor, and Peter = Hufflepuff. Their friendship supports the unity that the Sorting hat has stressed, and it was a very thick bond as far as we know. But then it comes down to Peter, but that I'll explain next. So bare with me on this and ignore all fact that Peter betrayed them. Remus is very smart, which suggests the best house for him would be Ravenclaw. Sirius, well OotP kinda suggests it more than I can really explain. Look at the house, look at the family. He never made mention that his parents hated him due to his not getting inducted into Gryffindor. And in PoA when I think it was Rosmerta that said it (the movie has me a bit confused maybe) but she was in shock that Sirius would betray them and be a Voldy supporter. Why? Because Sirius was most likely an outcast in his own house and hated everything about it. We know for a fact he hated his family and what it was to be a "pureblood" and what they did to those who chose to disagree with the rest of the family. James we know is in Gryffindor. Oh! And about the mirror at the end of OotP, the fact that James and Sirius were in so many seperate detentions suggests that not all of there classes were together, which also suggests different houses. And Peter, well it's Peter. He didn't seem much of ANYTHING really. And Hufflepuff is sort of the stragglers from the other three houses. It makes perfect sense that they'd all be in different houses. It would make their friendship more important and bring about a significance to the 2 remaining houses that are mentioned mainly in passing.
Peter Pettigrew will redeem himself! This is purely just a hunch. I really have no evidence towards this, but just a damn good feeling about it. Let's say...oh I don't know....he's the Grima Wormtongue of Harry Potter. I hope that makes sense. I still won't like him if my feeling is right, but at least he made it right somehow.
Harry Potter might die! Ok, trhis I'm up in the air about. I'm still really confused about the Prophecy and one line of it, but it does somewhat suggest that in order for Voldy to snuff it, Harry will too. Harry does contain quite a bit of the power Voldy had/has and let's say that it wouldn't surprise me if that's what happens. I've no real evidence but it was suggested to me by Emily who I think has a pretty good idea about that.