Okay, there's a definite argument for there being smaller size classes included. I'd hope we don't see any Legends being passed off as Generations, unless they're able to find a way to make the former-Casseticons work with modern alt-modes, and a deluxe Soundwave (or voyager) to interact with them.
I could live with a bunch of Commander/Scout class guys though.
I'll second the call for Headmasters and Targetmasters. Not sure how the Headmaster gimmick would look if it was a minicon-size head on a deluxe size body though. I'd probably be mostly okay with just the TF characters themselves, to be honest. Would love a Needlenose, Spinister, Chromedome, Brainstorm, Mindwipe, Hardhead (I'm not really a fan of the Universe/IDW look) etc, etc. It wouldn't even bother me too much if the Headmasters were changed to be more like PCCs, with the little buys just being add-on Minicons instead of the heads. Would make a new type of Fort Max more appealing.
I'd like to see more Pretenders characters. Wouldn't have to be actual Pretenders so to speak, the way Thunderwing, Skullgrin and Bludgeon have turned out has been fine. I'd love a Catilla, Carnivac, Stanglehold and Octopunch to add to my collection. Stranglehold could be a tank of some kind, and Octopunch a submarine, or even an octopus.
Dinobots, be they WFC/FOC inspired or not would be good. I'd actually be quite happy with a pre-Swoop version of him as Divebomb, from the G1 comic flashback story. That was a pretty cool alt-mode. I use MP Grimmy for my Classics version, a deluxe would be too small IMO, but voyager would work much better in robot mode. Snarl and Sludge are the only two I can't see selling that well.
Predacons...Razorclaw and his guys...would be very welcome too. This would be my preferred follow-up to the Bruticus combiner. And I've said it before, and I'll say it again, there are more than a few repaint options for them.
I'm more than familiar with losing out on toys late in a line due to distribution here in the UK, and whilst I personally have no interest in movie Soundwave, Que or those guys, it would be nice for people who do collect movieverse stuff to be able to get these, so I'd definitely stick them in the Gen line, if there's to be no Movie Trilogy line. Of course, they might keep them til TF4, but that's a long time to wait.
Last oddball choice is to do some more HA basics priced as deluxes for the Generations line. They needn't even be true HA toys, but I'd like to see HA human figures of the G1 toon humans. Spike, Daniel, Marissa, Dr. Arkeville, etc.
edit: SCRATCH THAT - Last oddball choice is more transforming versions of Action Master only characters. I want a Roll-Out that transforms dammit!
assembling a Neo-G1/TF:TM cast. Please PM if you have (or know of) the following at a reasonable price: Classics or Henkei Prowl, Astrotrain, Ramjet, Skywarp, Sunstreaker, Sideswipe, Blurr, Perceptor, GDO Wheelie and Springer, or 3rd Party Motobot Arcee, FP Springer, iGear Ratchet and Ironhide, City Commander (and/or Ultra Magnus), Starscream (deluxe) Coronation add-on, or Spike and Daniel in their Exo-Suits.