If Lot becomes a recurring character I hope it doesn't become like Morgause/Cenred.
Oh, did they mention Pellinore already? I'd forgotten about that. I agree about the knights being underused, but based on what we've seen previously, I'm pretty sure they'll introduce at least one or two new characters from the legend in Series 5 although they'll definitely change a lot about the character. (in S1 it was: Nimueh, Lancelot and Mordred; S2: Lady of the Lake and Morgause; S3: Gwaine and Percival; S4: Agravaine, Tristan and Isolde)