We are still left wondering where Brainstorm, Cerebros, Hardhead, Highbrow, etc came from. Were they on Paradron? On one of the other planets that was colonized? In another stasis chamber on Cybertron perhaps?
Or course there are still pleanty of unrevealed origins for Autobots in that setting... The Protectobots, Hot Rod, Blurr, Arcee, Broadside and Springer all still appear from nowhere and join the Autobots in the TV continuity. We sorta get an implied origin of Omega Supreme that he came to Earth under his own power.
Also, to this day I don't think Topspin, Twin Twist, Whirl or Roadbuster have appeared in the TV continuity at all, and they are in year 2 Autobots.
Edited by mignash, 11 January 2012 - 12:59 PM.