The recently released issue of Nintendo Dream magazine contains a New Year card signed by Game Freak. In it, they promise to "do their best to work toward the next evolution of the Pokémon world" (see source for the Japanese quote).
It's a somewhat vague statement, but I think it's relatively clear that they're referencing a new generation.
Just putting some ground rules here:
1) Discussion about YellowGiant and his "leak" is banned. Any discussion of it will be treated as a Pointless Post.
It's very, very, very likely that his original leak was fake, regardless of whether his admitting to it is real or fake (and frankly, who cares?). He actually joined this forum last night and made a simple post cursing you all for making no one believe him and that he "wanted to be famous". I quickly killed the post and banned him - so it's obvious that all he wants is "internet fame", so let's not give him that. We'll find out on Tuesday if he was making it all up (which I'm betting he was).
2) Please don't spam GIFs
Yes, we know they can sometimes be funny or whatnot, but I don't want to see them all the time. A post that has a GIF and little else that adds to the discussion will be treated as a pointless post.
3) Please don't ask what time the announcement will be made
We're all as excited as you are, but constantly asking or posting when the announcement will be made does nothing but disrupt and spam the thread. Posts asking about when the announcement will be made will be treated as a pointless post.
The announcement will be shown in a ten minute "Pokémon Direct" tomorrow (8th January) from 11am GMT (12pm CET, 6am EST, 3am PST, 8pm Japan time).
Also, while I know that this is an exciting period for us all (Each day feels like a week for me, personally) calm down. The Bulbagarden staff will not tolerate any kind of abusive behaviour towards other members. This thread has already been closed once and it is out of my kindness of not wanting a few bad eggs to spoil it for the good majority that I am re-opening this, so don't make me regret it.