WFC-E31 E7461 is Autobot Alliance: Prowl & Ironhide. We know this from an Amazon listing but not seen the toys. Same listing tells us WFC-E27 is Decepticon Elite Fighters. Identity Unknown atm.
WFC-E26, 28, 32 & 33 we don't know for sure but are 4 unrevealed by Hasbro toys.
Leaked, as in we've seen pictures, are
Alternate Universe Optimus Prime (the black dead Op)
Toyline TBC Soundwave & Cyclonus
Top Gun/TF Crossovers Maverick jet
Various listing leaks reveals:
Exhaust probable retool of Wheeljack Greasepit probable retool of Ironworks Bluestreak
Thrust (now seen)
Rotorstorm repaint of Siege Spinister Hothouse probable repaint of Airwave Hubcap new head repaint of Cliffjumper (now seen) Mercenary Bugbite probable repaint of Cliffjumper/rumoured BB Roritchi repaint of Fasttrack
G2 Megatron repaint of Earthrise Voyager Megatron
Wal*mart Red(? Redeco)
Megatron Soundwave (redeco?)
Bumblebee Quintesson Wheeljack Impactor Deep Cover Red Alert Barricade Elita 1 Cheetor
STUDIO SERIES 86 SERIES
Grimlock & Wheelie
The assumption is Bumblebee, which Bugbite insinuates, is coming as is Runabout, from Runabout, and Ramjet & Dirge, from Thrust. They might be the Elite Fighters/Hunters pack
It's not a huge leap to get from a Decepticon 2 Clones Pack to an Autobot Clones 2 pack
I was just wondering why Knockout, but then if you're doing Prime figures (as with the Arcee before) he's a good option because he was so popular. You wouldn't want to go for the obvious ones (Prime, Megatron etc) because they'd be on the shelf at the same time as their G1 versions.