User blog comment:Western Gen/Speculations for Season 13/@comment-26287951-20150416160017

from what we know so far I think that:

The aliens (including Junior) will make a return

Sharkface will be kitted out in the Meta's gear and will seek revenge against Carolina and Washington

The Counciler will aid the inserectionists up until it suits him and go into hiding.

Epsilon will "die" (we know this but I belive it will be something to do with the headaches he gets in season 12)

Dr Grey will betray the Reds and Blues and be secretly working for Charon  (or at least the former)

The Teleportation cubes will turn out to have some form of negative side effect from constant use

Despite their differences Kimble and Doyle will band together to fight the aliens.

Doc will return with important plot details