I think the closest you're going to get is Roland, which is pretty incredible in its own right. You should check that out if you already haven't.
Midnight Carnival looks very cool. For budget price it will be a definite buy when I get my PSP next year.
Probably not. LocoRoco was developed by Sony, they're not going to put it on iPhone.
I'm a little on edge about this. I loved LocoRoco 1, but 2 was terrible. They must have fired their good level designers, forced us to play through a bunch of crappy minigames, and kept trying to force some joke of a story on us with a ton of really long, annoying, pixelated cutscenes, many of which were unskippable. The level select area was horribly designed, and even the loading screen was ugly. And to top it off, it was half the length of the original.
What with LR2 being so bad, I'm very wary of this, as much as I want to love it.

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