The remaining $50 item is an army builder pack, that has been confirmed by ToyGuru. Therefore, it cannot be Stridor, etc. A lot of us are hoping for Horde Troopers, but that is still to be determined.
It was also stated by ToyGuru that the 3-pack of the Fighting Foe Men was the last planned 3pack. Therefore, I doubt we will see a Two-Bad, Badra, Tuvar 3-pack.
Having said all that, I bet we see Spinnerella, King Miro or Evil Seed, and the reveal of the Horde Troopers, plus some extra goodies.