The fantasy drama's fifth run - which bears the tagline 'The die is cast' - is currently filming.
The promotional picture - which features stars Angel Coulby (Gwen), Bradley James (Arthur), Colin Morgan (Merlin), Katie McGrath (Morgana) and Richard Wilson (Gaius) - shows Guinevere taking her place upon the throne as queen of Camelot.
Co-creator and executive producer Johnny Capps also revealed that Anthony Head will reprise his role as Uther Pendragon as a guest star, and said that the series will potentially be turned into a trio of full-length films after filming on series five has finished.
Capps said: "We're hopefully going to do a trilogy - three movies. We will focus on them when we finish season five.
"One idea we've been playing around with is to reboot the whole series [for the films]. We would go back in time and start the story again and show different parts that you didn't see in the series. The other idea is to do a continuation, but we haven't decided yet."
Game of Thrones star Liam Cunningham was confirmed to join the cast back in April, while John Bradley will play a character named Tyr Seward.
Take a look at the new Merlin image below:
Merlin will return to BBC One later this year.
Photo gallery - Comic-Con 2012 stars: