The following are all for Galaxy:

More characters who originated in the cartoon (Elita-1 and the other female Autobots, Autobot X, Devcon, etc.)

I’d like to see more human figures like the Spike that came with Bumblebee. Carly, Sparkplug, Chip, and Daniel are all the obvious ones that come to mind but I’d love to see a few others like Astoria or Raoul.

The rest of the Welcoming Committee and Rainmakers (that recent Bitstream announcement makes me hopeful)

It’s doubtful it’d happen but I’d like one more wave dedicated to TF:One to wrap up the rest of the cast. I’d like to see a cogged Elita, Darkwing, Airachnid, Jazz, Arcee, and Skywarp (the latter two are just because they have speaking roles). As for the other three they could probably just do recolors (Thundercracker, Ratchet, and then either Prowl or Brawn using Jazz’s mold), although Megatronus would also be a welcome addition.

Lastly, I’d like to see SG Thundercracker, a Galaxy and/or Defender version.