Okay (I didn't find one anyway). Platinum is great! The graphics are better, the storyline is different from the start, and all of the online stuff is updated. I just beat the first gym, and I've been to the various new Wi-Fi areas. Its really fun.
It looks pretty awesome so far. I'm not going to be able to do much, since I've got to go to dinner and I want to set up the challenge I'm doing for it, but even the intro is awesome. It all looks cleaner, if that makes sense.