FECKING HELL YEAH!
I do want to say though, I really want to see a new starting combination. We've had Fire-Grass-Water for four generations now, I think it's time to change it. I wouldn't know what to though, but I'm sure they could pick a balanced one. Looking at the new Pokémon there, I kinda hope they're a new Dark-type starter.
But really, I don't know what they can do for Legendaries. I mean, we can catch God (Arceus). What can be more Legendary than God?
I don't get why people don't like Pokémon from Gen three or four though (Probably have their rose-tinted nostalgia glasses on. I kid!

). I thought there were plenty of awesome Pokémon in them, but maybe I'm in a minority.
And for the people saying it's too soon since the last generation, remember that gen four (Diamond and Pearl) came out in 2007, three years ago, which is a big enough gap if you ask me. Platinum was just the third game of it, which combines the last two, kinda, and HG/SS were only remakes, not new gens. I think it's been a good amount of time before making the new generation.
Battles could do with some actual attack animations though, or, and I'd rather this, a quick battle mode, so we don't have to spend five minutes battling the Ratata of this generation.
A new type I can go either way on. If it's balanced, sure, why not? Maybe it can be for just one Legendary, which is what makes it deserve its status.
So yeah, I'm looking forward to it, but they really do need to change some things. (And I probably have more to say, but it's late and I'm tired, so I'll leave it)