I too was surprised to see Iyanden as one of the first four, but given the presence of PvE Tyranids it makes sense to have a Craftworld in the mix who despises them instead of yet another sub faction who's out to get the Imperium (Alaitoc). I'm glad for this because it helps the Eldar come off as more their own protagonists than just another antagonist of the Imperium. Plus, since pretty much the dawn of 40K, Iyanden has been neglected by GW and the gaming community. Of all the armies at my local bunker, Iyanden is one of the few I have never seen played. Maybe now that they're getting more attention, it will set a precedence for GW to stop focusing so much on the Ultramarines... I've been wondering about this myself. Do you have any information that hints at a date in which EC will take place?