When I first heard a villain was returning, my head went straight to Adam. He was a heavily hated character. I couldn't stand a second he was on screen and from his page, under reception, many would agree. I even did a little detective work to make sure I wasn't missing anyone. I got on the Antagionist page and crossed all the stupid ones out like Zanthar, Craig, etc. Then the dead. Then some of the fragged. After that I was left with two, Trent and Adam. Trent has been an antaganist of two consecutive seasons, so I'd like to think Jon wouldn't go down that route again. My only thing about that is that this new season seems heavily centered on the toy side of our heros. Adam has no clue that Arbiter and Master Chief are toys, Trent does. Considering that, that would be the only reason why I think Trent would come back.
Regarding the music, anyone else get the feel that the tone is saying "I'm back mother fuckers." I love both tracks.