But Geass was #10 in anime DVD sales in Q1 2009. Kurokami is coming in fresh, albeit off of a TV run and an online stream. Geass or Gundam would make more sense for high-def first, it seems to me. But hey, that said, they may very well know what they're doing...
Edit: Well, come to think of it, a lot of the people who might buy Blu-Ray already own the Code Geass DVD's...ergo, actually, doing it upfront with a new title probably is the best move by far. There's no guarantee people will double-dip at all, especially when the show isn't even done releasing. And yeah, it's expensive. Gundam 00 is just about the only series I would buy in HD right now.