Encore 20: Devastator.
Encore 21: Twincast
Encore 22: Soundblaster
Listings have also appeared from Hasbro's branch in Malaysia indicating the Commemorative series is making a return...although there appears to be some confusion as to who.
As with the Seacons reisuse, it's quite likely these would hit retail in Asia...but be online only in the U.S.
Edit for clarification:
Hasbro re-reissues are those already reissued. Datsuns, Hot Rod, Astrotrain. As of this edit date, still nothing more. Probably shelved... Perhaps because Hasbro Asia are also agents for Takara, and there's just plain A LOT
of toys being released at the moment.