Don't know if this has been discussed recently, but here goes.
A number of pilots are likely to show up in the future for the Rebels. Some of them make sense for inclusion in a possible "Rebel Aces" package. I assume this pack would be a pair of repainted X-Wings, but maybe not. Perhaps a pair of mixed re-paints?
Here are some possibilities:
X-Wing Pilots from Rogue Squadron
Arhul Narra: I had never heard of this guy, but being listed as a co-founder of Rogue Squadron alongside Wedge and Luke makes him a very attractive "Ace".
Derek "Hobbie" Klivian: Has to be involved somewhere. Actually has some screen time in the OT.
Gavin Darklighter: guy from many novels
Corran Horn: a notable guy from a good series of novels
Tycho Celchu: The first cross-vessel guy (here flying his X-Wing instead of an A-Wing).
Flew Against a Death Star, Yavin or Endor (and died, like Biggs & Arvel)
Pretty select company. These people have screen time, too.
John D Brannon: X-Wing, Red 4
Elyhek Rue: X-Wing, Red 7
Bren Quersey: X-Wing, Red 8
Theron Nett: X-Wing, Red 10
Tiree: Y-Wing, Gold 2 (shot down by Vader)
John Vander: Y-Wing, Gold Leader (shot down by Vader)
Davish "Pops" Krail: Y-Wing, Gold 5 (shot down by Vader)
Grizz Frix: X-Wing
Ekelarc Yong: Y-Wing
Sila Kott: A-Wing; female pilot
Keir Santage: X-Wing, Red 7 (flew into 2nd Death Star with Lando, Wedge, Tycho, Horton, and Farrell)
Flew Against a Death Star, Yavin or Endor (and Lived!)
Jake Farrell: A-Wing, flew into Death Star II with Lando
Gemmer Sojan: A-Wing vs DSII and GR-75 Transport pilot at Hoth ("Bearing Lifter")