I assume Bedlam broke out of the dungeon and staged a coup to take over Markovia, necessitating Brion and Tara coming back to stop him.
I'm guessing this time, thanks to character development, Geo-Force will actually be able to beat his uncle (with his sisters help, most likely).
I don't think Metron intended to take Lian. He was after Halo and she just got Boomtubed because Halo was holding on to her.
Also confirmation that the Light (speficially Lex) is behind Infinity Inc. and the rest of the Oustiders take on Granny/Gretchen.
If Terra can control Earth, does that mean she could control her uncle?