User blog comment:Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd/Why was the Battle of Camlann the theme of Series 4?/@comment-4650675-20121214132112

I don't think it is the battle of Camlann. Only the background color is familiar!

Or maybe, since that's where Morgana first saw Emrys, it wanted to warn us about the major plot of series 4-The search for Emrys.