Interesting point about it being the Isle of the Blessed and Merlin's reluctance. I'd like it if Morgause knows about Merlin.

I'm guessing:
- Morgause is the Aunt
- Arthur speaks with his dead mum and gets the whole backstory
- Arthur attacks Uther because he has killed so many when he is guilty himself - and now Arthur realizes HE (Arthur) has innocent blood on his hands
- Perhaps, just perhaps, Morgause is pro-Arthur and "leaves" Arthur in Merlin's hand to protect him (hence she keeps Merlin's secret). I'd like that.

I don't expect a Mordred connection, nor, unfortunately, a Morgana connection.