I do hope the beginning of series 4 focuses on Uther and Arthur's relationship, we didn't get to see much of it at the end of series 3 and I want to see how the deal with Morgana's betrayal and then see how Uther reacts to the knights and possibly to Gwen if that is revealed.
I'm not sure what effect Morgana's betrayal will have on Uther. It could soften him but it could also make him even more of a tyrant.
I can't say I'm too interested in the Gwen/Lancelot thing but I do hope Elyan stays. I like Gwen having something to do that isn't to do with Arthur or Morgana. Angel Coulby really shines when she is given something interesting to do and I hope they use her character more in series 4.
Even though I love Morgana and tend to get bored by the episodes where she doesn't play a major role (lol, fanboy) I hope she doesn't come back STRAIGHT away. I'd like the focus of series 4 to be on Arthur/Uther/Merlin/Gwen/The Knights and then just as everything seems settled, THEN Morgana comes back. I much prefer the idea of her being a like lingering dark cloud over their heads than her just keep popping up. It would be kind anti climatic if Morgana and Morgause show up in 4x01 in the centre of Camelot causing chaos. I mean by all means I'd like to see what they are up to but just away from Camelot for a little while. Also, is series 4 being aired in 2012 or 2011? I keep finding different sources saying different things *prays for 2011*