yes of course you would want it on the PS3 but since KH:BBS is for the psp, we can really see that happening anytime soon.
why don't you just get a tv connector for your psp and play your psp like that. Whats the big difference
The big difference is that not everybody wants to go buy a $150 device when they already bought a $300 one from the same company. Honestly, if this is received well enough, Square Enix will probably make a sub-par port of it to the PS3 anyways and just put it on the PSN store.