The music reminds me a little of .hack//SIGN which has one of my favorite soundtracks. Especially the opening scene with Syaoran and Sakura separated by an invisible wall. I like Clamp's visual style too, lots of flourishes, elaborate patterns. I hope they have a sci-fi setting later, I love their mechanical designs.

As far as I understand it the characters in Tsubasa are suposed to be "alternative world" versions of the Cardcaptor Sakura cast. I think this might actually work out. There are a lot of good Clamp characters, some of which probably wouldn't otherwise be animated because the manga they're in, although good, are too short (like Wish or Clover). And we can play "identify the manga source." Speaking of which, does anyone know if Kurogane or Fye are from anything else? Or caught another reference?