I love the new card packs, but I bet a lot of people were disappointed that our favorite pilots and crew from the expanded universe didn't make it in. That gave me the idea of card packs based around popular pieces of extended universe content.
The recent Alphabet Squadron/ Tie Fighter comic crossover is a perfect example. A pack centered around the characters from these stories would be great. It could include the named tie pilots (with built in nicknames and pilot ability ideas) plus one extra pilot for the 5 rebel ships and a handful of crew option for each faction. Since its unlikely either OG faction will be getting new ships any time soon this could fit right in any wave. Lost Stars, the Aftermath trilogy, and the Thrawn trilogy would all make great theme packs.