At last another piece of the puzzle has been revealed! On the leaked Hasbro toy list some time ago, there were a series of listings for something called "Age of Extinction Legion class" in both single releases and two-pack releases. Via the Transformers Facebook page, we now know these releases are a mix of previous Cyberverse Legion figures (both past Movie Legends and Legion Cyberverse, and Prime Cyberverse). The two packs feature some larger toys from Transformers Energon and Beast Wars. It's a very odd assortment! Check out the images attached to this post, 16 in total.
Releases seen for this assortment so far:
Legion Single Packs
Bumblebee (from Revenge of the Fallen Legends Bumblebee)
Stinger (from Transformers Prime Cyberverse Legion Knock Out)
Optimus Prime (from Revenge of the Fallen Legends Optimus Prime)
Grimlock (from Beast Hunters Cyberverse Legion Rippersnapper)
Legion Two Packs
Bumblebee and Strafe (Bumblebee as above, Strafe is a redeco of Beast Wars Basic Terrorsaur)
Stinger and Slug (Stinger is a redeco of Revenge of the Fallen Legends Sideways, Slug is a redeco of Beast Wars Neo Guiledart / Dinobots Triceradon)
Optimus Prime and Grimlock (Optimus Prime as above, Grimlock is a redeco of Transformers Energon Cruellock)
Legion Bumblebee VS Stinger set - Bumblebee is the Dark of the Moon Cyberverse Legion Bumblebee with a Prime Cyberverse Bumblebee blaster. Stinger is the Prime Legion Knock Out as before, with a Prime Cyberverse Ratchet blade weapon. Strafe is the Age of Extinction Generations Deluxe toy.