Two comments were added in the comment section of the official site, I'm a bit late, but here it goes:
I think I want to express all the series' power.
In charge of the Opening Theme: MAKINO Yui
This time, it turned out I was to sing the opening theme, I fell awfully happy! With the theme song of the movie from about 2 years ago, I recieved the occassion to make my debut as a singer, I thought back then that I would absolutely do it again if another opportunity occure. The Tsubasa series' existance is really precious to me, I love that work. This time again, I feel really happy about singing a theme song of the same type. The recording is yet to come, but as Makino Yui the singer, I think I want to express all the series' power. I wish I'll do well.
[She seems really enthousiast about the project, although there a bit of naivety in her comments, I don't know if it's good or not. Well, I don't like her much as a singer, but she seems to have the right attitude.]
Please, enjoy without a fail!
In charge of the Ending Theme: SAKAMOTO Maaya
I feel very previledged to have been made the one to sing Tsubasa Tokyo Revelations's OAD's ending theme song. The TV series' first season's ending theme, "Loop", was about Syaoran and Sakura's fate. The second season's ending theme, "Kaze Machi Jet", came out as a musical composition showing the bonds between the companions in a continious travel. With what kind of song will I show Tsubasa's world viewpoint this time, that's where my imagination started to bloom. Please, enjoy without a fail!
[She really doesn't say much beside that it will be different from Loop and Kaze Machi Jet ...]
Which makes me wonder, will there be single for these theme songs? Or will they be avalable in later albums from these two singers? Well, TB, TB2, Miyuki, Rayearth and X OVAs all had their theme song avalable on single no long before or after, so the odds are high, but still ...