Theo to be back in 6B
I've heard he'll return very soon like in episode 3 and will have a big story and will again be paired up with Liam and sometimes Scott.
shareThis what Jeff Davis said about Theo in 6B:
"Where do things lie with Theo when we pick back up?
We come back to him in the second episode of 6B, and you find out where he's been, and it's a very sad story that puts him on a new turn and allies him with our pack. That's part of the overarching story of 6B, which is for us very much about the outsider."
Source: http://screenertv.com/television/teen-wolf-jeff-davis-talks-6b-stydia-scotts-purpose-beacon-hills/