Aside from ones we know we're already getting, like Dead End, Breakdown, Swoop, Rumble, Bombshell, Shrapnel, TM2 Megatron...
Victory updates. We need these to go with our Star Saber and Victory Leo. Especially Deathsaurus and the Liokaiser team. Titan class combiner for Liokaiser maybe? And with a Deathcobra maaaaaaybe?
Monstructor.
Gears. He's one of the only minibots that has no good update since the 80s. And he's in 28 episodes of the original show. Way overdue. And no, I don't think they did a satisfying job with the Swerve retool in 2014.
Swerve (obvious Gears retool if they do a new Gears).
Bumper!
Throttlebots. Freeway, Wideload, and Searchlight. They're in The Return of Optimus Prime. So I must have them. Rollbar is not, but I'll take him too. And Chase had a toy I was fine with (Roadburn) in Titans Return, but I wouldn't mind a new one if they wanted to do one.
Rewind, Steeljaw, and (the unstoppable bad-ass) Ramhorn. Blaster needs his cassettes.
Transmetal updates. Optimus, Megatron, Cheetor, Rattrap. Especially Tarantulas.
Transmetal 2 updates for Cheetor and Blackarachnia.
Other Beast Wars updates. Voyager Silverbolt, Deluxe Quickstrike, Commander Rampage and Depth Charge, Leader Dinobot II. Leader(?) Tigerhawk. Would Optimal Optimus be a good Titan class?
Beast Machines updates. Everyone in the series to-scale. Nightscream would be a lot smaller. Tankor a lot bigger. And finally a Botanica!
Scrapheap, though I suppose he'd probably be sold as another Studio Series 86.
Earth mode Hound. Yeah, the Universe one is strong. But it's older than Combiner Wars, so I'd like to see a new one anyway.
Frenzy. But I guess with the new Rumble coming he's almost guaranteed.
Ratbat. Why not? We're getting a new Rumble (though Rumble is obviously much more important). Did anyone find the previous Ratbat?
Buzzsaw. He only needs to be a redeco of Laserbeak. So how has it not happened yet?
Sandstorm.
Alpha Trion that looks more like his Sunbow self. (UPDATE: Happened.)
Downshift, Overdrive, and Camshaft. Seriously, not even one of them yet? Though Overdrive at least got an Alternator.
Barrage, Chop Shop, and Venom. A new mold for Venom, I guess. But Barrage and Chop Shop can be made from Bombshell and Shrapnel, probably.
Beta and Devcon. Obscure picks, though.
TF Animated characters that look like the cartoon characters (and not like what HasTak did to the TF Prime updates). To-scale versions of the cast. Or at least the characters that didn't get toys before. Omega Supreme, Wasp, Slipstream, Elita-1, Cyclonus, Strika, Spittor, Red Alert, Alpha Trion, Cliffjumper, Highbrow, Brawn, Warpath, Hot Shot, Perceptor, Wheeljack, Mainframe, Yoketron, Rattletrap, Dirt Boss, Lightbright, Lickety-Split, etcetera. Especially Sari, Scrapper, and Mixmaster. Yes, I'm ready for all of them.
More Armada updates! The whole cast. Lots of articulation. Optimus, Megatron, Hot Shot, Sideways, Cyclonus, Demolishor, Scavenger, Jetfire, Blurr, Side Swipe, Smokescreen, Thrust, Tidal Wave, Red Alert, Hoist, Wheeljack, Overload, Star Saber, Skyboom, Requiem Blaster, Perceptor. And lots of Mini-Cons. :3
The Rescue Bots as Generations figures. They would look like the show and have better articulation and transformations than their old figures. At least do the main four.
Maybe some other stuff I'll think of later. ;P