Generations Nightbeat & Jhiaxus revealed
Don't get too excited, as they are both just redecos. (images are from an Asian online store)
Nightbeat is a redeco of the Classics-verse Jazz (from Reveal the Shield) so is unlikely to have a "headmaster" gimmick.
Jhiaxus is a redeco of new Armada Starscream.
(in some simple, awful colours... it looks like a Playskool toy)
There is also a drawing(?) of Windblade... which is an odd thing to have released by Hasbro to solicit pre-orders from retailers. The character art that was released at SDCC would be a better tool for that.
The dealer site lists them as a February release, but I think they might have just copied the format of another listing, as those should be later than that.
(the various prices on that site are so high, it makes our retail prices look good)