With the EU being tossed in to a blender, could it be that the Rebel Alliance can now fly E-Wings before the battle of Endor, and hence appear in the period this RPG covers?
Certainly this article implies so!
http://www.fantasyflightgames.com/edge_news.asp?eidn=4825
I think the E-Wing is one of the more pleasing designs to come out of the EU. In particular, it looks like it could belong to the same 'family' as the X-Wing.