So, in other word you mean the DS and PSP were already dead?
We have a few games coming to DS (mainly first party, like Kirby, Layton 4 and some 3rds), and I know some announces can still be made for it (localizations of games that are released already in Japan, like Ninokuni, Ace Attorney 2...). But what you guys have to understand is that the DS isn't simply the actual platform. The 3DS is already there, you guys like it or not. It makes more sense for them to release it there.
The PSP is still going strong in Japan, so that can be a platform of choice. But it's already dead in the west, people don't buy games for it in the west, even if the hardware sells.
And Wiiware is limited crap. Yeah, we saw Rebirth and such... but it could be even better if they released it on PSN/XLBA.
So yeah, they'll release the game where they think they can make more money from.