Over at Mania Anime on DVD, Chris has spotted a video page for what appears to be a Blu-Ray release for the CLAMP super-series Tsubasa, although the trailer for the video isn't actually up yet. And of course, neither is any of the pertinent information (number of episodes? Bonus features? I did some scouting around on the official Tsubasa site and on the FUNimation forums and I found bupkis. There is a March 17 2009 release date stated on the page, but Chris notes that it wasn't in the March solicitations mailer, so it's probably not coming out then.
But it's kind of an interesting thing to find considering that as far as I can tell, there haven't been any Blu-Ray releases of Tsubasa in Japan. Now, as I understand it the US can't release any anime on Blu-Ray unless they have access to materials of that definition from the companies in Japan. So this may also be an early sign of such a release happening in Japan. We shall see!
A revised version of the main characters of Cardcaptor Sakura join with some new characters in a new worldsetting, where they traipse around various universes featuring different versions of characters from other CLAMP series.