Most of it is American cartoons however.
ANN lists it as being all anime shows scheduled on that date in TV Guide. Bleach, Fullmetal Alchemist, Durarara, FMA: Brotherhood, FLCL, Bebop, and GitS.
Edit: Come to think of it, that's just what is airing now, so they may introduce something totally new. I recall reading somewhere that the premise is to make it an anime block, though I half wish they'd just rerun some of the old greats like they did for April Fools. We'll just have to wait and see huh?
that voice = Spike Spiegel
Steve Blum = Win. Apparently he was the big one pushing for its return. Further immortalizing him as one of my favorite VAs.