Jericho comes time to time when he has free schedule from his band Fozzy.
The Rock's last match was in Wrestlemania 29 this year and he lost the WWE championship to John Cena. He also had some serious injuries in this match and required surgery, dunno if he will come back to wrestling again.
They have been heel since they came like a year ago. They come from the crowds and interrupt a match by destroying most superstars. It's really something, the whole crowd gets up from their seats when their music hits.
As for feuds, nothing really that interesting. Any matches with SHIELD are good. Daniel Bryan looks like he's going heel soon and that should be entertaining to watch. John Cena is again the WWE Champion and he is just so meh, his character is way too boring. CM Punk was so entertaining when he held the title for more than 400 days. He has been away for a while and should be returning soon too.