I think the first order pack will go one of two ways
An ace style pack with a upsilon and tie fo. This allows them to get an upsilon in 2nd edition packaging with content that isn't in the conversion kit (to make me buy more upsilons). This would allow them to focus on crew/pilots that complements the upsilon.
They could also do two tie/fo's and a TIE/ba (with a more traditional paint scheme). The TIE/ba is fun to fly and they have room to work with the chassis.
I assume they will focus on characters from the resistance cartoon in either case.