Probably more Autobot cars. I should think Sunstreaker will be along soon. Followed by Prowl and Bluestreak, although I would prefer Smokescreen.
For the Decepticons we will see a few repaints, Skywarp and Thundercracker, and Soundblaster.

After that likely to see some amazing announcements. Ultra Magnus and Blaster for the Autobots. Megatron, or Galvatron?