You're right...if anything, with the new drop gauge and the switching out between Sora and Riku randomly, this game seems like a drastic step away from BbS gameplay.
Also, I recall someone found the Kingdom Hearts Dream Drop Distance logo and some character models in BbS or something like that as hidden files. If that is true, and the DDD trailer thus far have been using the PSP engine, then we have absolutely no clue what the final game will look like. There is no guarantee that the graphics will be better.
It wouldn't be so bad if it wasn't being launched on a new and relatively unappealing handheld...if they release a version for the psp I'd be all for it, but I'm just kinda tired of KH at this point. It's very producer friendly, with no disregard to the consumer or its fanbase in general.
@chihuahuaman, the 3ds actualy does not have better graphics than the psp, it does however use the same shading engine as the xbox360, or at least a similar one, also without proof...there's no reason to even make a claim.