When thinking about wave 7, I came up with the next things.

U-wing : they're already in X-wing so why not add them in armada?

TIE-reaper : a mostly forgotten ship in rogue one, you only see them at the beginning of the movie and 20 seconds at the battle of Scarif, i think they should make a cool addition to the game.

And also admiral raddus' MC75 should be added someday, but don't forget to also add new imperial large ships because else you could get like 7 large rebel ships and only 3 imperial.

Whatever they add, please give it less officer upgrade cards and more other upgrade cards, i mean you have like 30 officer cards and only 6 offensive and defensive retro. 7 ion cannon...

Whatever, they should add more upgrade cards other than officer.

I probably forgot to mention a lot of things that should be added but otherwise I should have a 1-page long topic. Tell me what else you want in wave 7 or new ideas for star wars armada, thank you!

It is generally hoped that squadrons do not appear for the next few waves, as we have a ton of them now.

I would also redirect you to the various threads on the main forum that discuss this very topic:

Welcome to the forums (belatedly, but soon enough) btw.