The reason I think Y-wings are a no-brainer to include is because there are a BUNCH of pilots from the original trilogy they haven't used. As it stands, they only have used one named pilot from the movies, as Salm is an EU character.
And remember, FFG has fleshed out a ship in the past that was considered the best in its faction: the B-wing.
The second ship I think could be the Xwing, Ewing, or even the HWK could use something to address the 1 attack die issue.
It would make sense to add the Y-Wing, yes.
Hmmm a high tier fighter and a bomber... it reminds me of TIE Defender + TIE Bomber.
OK, it will probably be E-Wing and Y-Wing. (X-Wing could benefit from common upgrades or droids)
Well, bye bye Corran in the X-Wing (does that mean we get Luke in the E-Wing?)