http://www.youtube.com/watch?v=8_KO67wCvUc
Here is a new video they just posted about the creation of the Flame Atronach. You can read more about it http://elderscrollsonline.com/en/news/post/2013/08/19/creating-eso-flame-atronach
The Flame Atronach in the end is blue. I think it might be one of the corrupted ones that you might see when you venture into Coldharbour. I think I remember seeing them when they released the Coldharbour video. Otherwise I'm just speculating here and they could be something else.