This is taken from an interview just before Episode 4.05 aired in America which makes it look like Lindsay Duncan could be returning in Series 5.
"We were lucky to get her," "Merlin" executive producer and series co-creator Johnny Capps said. "We wanted an actress who could give the character a real heady weight of authority, and her performance is absolutely brilliant. This is a character that will definitely be returning.
"Lindsay brings this real gravitas to the episode, so the world has more at stake and feels more real and allows (the viewers) to realize that there are others kings and queens in this fantasy world--and that there are repercussions for people's actions."
Source: Red Eye
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