In lieu of the Infinity Ward debacle it was super important to Bungie to keep "some" ownership of the IP's that there going to develop.
Reading this article plus Jonnys' comment made me go,
"Yaaaaa!, awwww man.... wait.... aaww man"
Because it's cool that this developer can go multiplatform(it kinda already could but that's a technicality), But Jonny's right, there's no way they would want to spend the time to "add in" motion controls(there not too high on that stuff, no matter how many platforms it's on) aaaaaand what ever they make will probably be developed for the 360, half a$$ ported to the PS3 i.e., not using any cell tech, and be a joke on the Wii and some two cartridge crap on the DS al-la Transformers......I sound bitter don't I......