From various throw-away lines, characters, and situations in The Force Awakens, there could be comics (or whatever EU will become) plots. I can think of the following (consider some of them to be SPOILERS, I guess):
- Threepio's red arm (a soon-to-be published C-3PO one-shot)
- how FN-2187 was taken by the First Order (and maybe his actual name) and trained (training has been covered in a YA novel)
- theft of the Falcon (Irving Boys, Unkar, Ducane, etc.)
- how Han and Chewie get their cargo "ship"
- that rathar event Finn mentions
- any Maz backstory
- any San Tekka backstory
- Luke's lack of synthflesh on his hand
- birth and childhood of Ben Solo
Others? And would you want to read these tales?