I actually liked the Pokemon graphics in D/P. The problem with the graphics in the games were some design issues, which, as you said, were fixed in Platinum and HG/SS.
But I think the graphics were amazing in Pokemon Black and White.
Well I think there will be some changes to the story with the coming of the new Pokemon manga, which is supposed to have a more mature theme than the previous manga and anime. I think what might happen is that, instead of remaking gen3, they'll make two new games in gen5 with a more mature plotline. That would be awesome. :3
Yeah, it does. Since I have both Black and White, I'll trade all my old Pokemon to White, then I'll reset the game and play through it a few times to get familiar with it, like I've done with generations 1, 2 and 3. I never really played through DPPt because...I'm actually not sure why. XD; I'll probably play through them these coming holidays as well.