Thus far, we have Vandervoort and John "Pa Kent" Schneider returning for the final season reunions. Nobody has yet heard if show icons Michael Rosenbaum (Lex Luthor) or Kristen Kreuk (Lana Lang) will return for the final season. Lana is someone I could do without, but hopefully Lex will at least make a cameo in the finale.
It's likely that the episode will deal with Kara escaping her self-imposed exile in the Phantom Zone and giving her something of a Happily Ever After And Possibly A Spin-Off. What do you think is going to happen to Kara?