According to a cinema listing, two new forms for Kyurem have been revealed, one based on fire and one on electricity. This falls in line with the two signature moves it doesn't have yet, Freeze Bolt and Cold Flare.
In addition, Meloetta is allegedly set to have a part in a small movie tying in to movie 15, so that's two new event Pokémon in the same year. This has huge implications on generation's 5 pacing, as the fact that there were four new event Pokémon were the only solid reason why gen 5 would last the usual four years. The fact that we'd get a two-for-one deal this year strongly suggests that gen 5 will only last three years, as suggested by the DS' rapid decline and the blazing pace of the anime (the group being at Mistralton a year and a half in). This means Gray will be coming out this year, immediately followed by gen 6 as soon as next year. So it seems that the last chance for those still hoping against all hope for a gen 3 remake soon has been utterly crushed, if this is true.
The situation is probably going to evolve rapidly, I'll update this post when it does.
Update: This just in, the poster is legit! This is the big announcement on Pokémon Smash. Those expecting Gray will have to wait a little longer, but the Kyurem forms are a dead giveaway that it's going to happen just as planned.
Update 2: "A little longer" amounts to fifteen minutes, as it turns out. And we have a real shocker on our hands, as we don't get a single deluxe version, but rather two, dubbed Black 2 and White 2. We also get a closer look at Kyurem's new forms, and they look like it's merging with Reshiram and Zekrom. Can't wait to see where they go from there. By the way, those two games are for the DS, as expected. Told you it took too much in the way of resources to redo everything from the ground up on the 3DS.
Update 3: Two more things. The names of the Kyurem forms will be revealed next week, and the US site has already been updated with them and the existence of BW2. Does this mean we'll get a faster localization than we usually do? One can only hope...
Update 4: BW2 is confirmed to come out in Japan... in June! I'm surprised because it's so close, but at the same time they really want to send this out the door ASAP, before the DS starts becoming a collector's item. This also means we're likely to see the international release before the end of the year.
Update 5: I think this needs to be addressed... a lot of people seem to think this is a direct sequel instead of a deluxe version. I don't know how they could draw that conclusion, other than the title, but the odds of that are almost nil. You know why it's on the DS, right? It's because they needed to copypaste vast amounts of data from BW1 (almost the entire game in fact), and you can't do that from a DS game to a 3DS one. If this were a brand new game, releasing it on the DS at this point would be senseless, over a full year after the introduction of a 3DS that gained lots of steam in the last few months. With that in mind, let's have a moment of silence for those unaware, unwashed masses who WILL buy it at release expecting a sequel, pop it in their DS or 3DS and drop an F-nuke.
Update 6: Kyurem form names revealed! Black Kyurem and White Kyurem. Not much effort went into these, huh? I would've much prefered Yin Kyurem and Yang Kyurem, but oh well.