Following on from yesterday's preview display for the fans & media, the panel presentation has revealed a couple more bits of toy info, as well as more details on the future of Generations with Machinima & IDW.

Images and details can be seen here.

As for the new toy details, it is noted that there will be another two Deluxes for wave 1 (but not yet revealed), as well as another Leader for wave 1 that was also not yet revealed.
But we've seen all four Heads for wave 1, and a second Voyager was revealed to be released with Galavatron - another Triplechanger - an Autobot called Sentinel Prime. It transforms into a spaceship and a train, and its head is called Autobot Infinitus. (something this unique must be a comic character, or soon will be)
It also notes that the head for Galvatron is actually called Nucleon, not Megatron, as Seibertron had noted on their official images, but it could have had a late name change by Hasbro.

It should also be noted that Fortress Maximus (or at least his head) shows up more than once... which should mean a new toy for him as well.
The Titans Returns comic doesn't start until mid next year, so I think he could be the mid-year big toy to coincide with the comic's launch. (and be the SDCC exclusive next year as well)