Well, further to this, IGN called some developers and all confirmed that the system is less powerful than the others, but it won't matter because of the unique controller.
Also in that article: big developers now have wireless controllers and kits that represent about 90-95% of the system's final power. Smaller ones have juiced-up cubes with wired controllers (that still do the motion control, obviously). They expect to have full dev kits for all developers in June. Not a bad timeline, it seems realistic for this to launch in December. I think it will have a better launch lineup than the DS.