After some problems with bittorrent I was finally able to see episode 25 and, like Razon said, episode 26 is NOT on the manga. So it's a completely new episode and not even I know what's going to happen.
However one thing is certain, if they are going to follow the manga (which they did so far), the group will not get seperated since they still have tons of worlds to go and feathers to collect, so don't get desperated.
I was only expecting them to leave this world in the next episode but I guess they couldn't strech it that far. On the other hand I'm really glad CLAMP created a new world for ep. 26 because if they followed the manga, even though the next world in the manga is a really small one that could fit one episode, it would of have been a very anti-climatic ending for the season.
PS: I still can't believe I'm going to have to wait 6 months for season 2.