User blog comment:Longlivemerlin/How will Mordred and Morgana will meet in Series 5?/@comment-84.250.219.102-20121005164629/@comment-4623180-20121005170249

He will join the Saxons.. or at least be a part of them for some purpose.

In the Australian trailer if you look carefully in the scenes with him, his chestplate has a saxon logo on it (the snake- see our Saxons page).