Robots and androids seem to me like a sorely under-served topic in these sorts of hard plastic kits, I'd definitely get behind seeing more of them!
There are a few bits and bobs that I know of out there - there were the 40K Necrons, a few Reaper Bones "Chronoscope" robots and androids in plastic, I picked up a great but very overpriced Doctor Who Dalek set somewhere and I'm sure there was a Cyberman set to go with it, some of the Stargrave plastic kits include mechanical arms, and Wargames Atlantic has some mechanical amrs in a couple Death Fields kits (Grognards Command and Cannon Fodder II come to mind) as well as some digital androids, but there's really not a lot, and even some robotic heads to go with the mechanical arms in the Death Fields stuff would be welcome!
(A model of Tobor the Great - someone else built/painted this, but it's great stuff!)
I myself would love to see a "raygun gothic" / "Art-Deco" style robot set loosely inspired by '60s sci-fi: Doctor Who's Daleks, Lost In Space's Robot, The Forbidden Planet's Robby the Robot, Tobor the Great, Star Wars' 'droids, the "mechanical men" or "atomic men" from old movie serials, and that sort of thing, - I'll age myself here, but that sort of thing is what robots were imagined to look like when I was a kid, and goofy as it is, I have a soft spot for them today!
Honestly though I can't see how any sort of robots could go wrong where I'm concerned - I'll likely pick a few up no matter what they are like! (The vaguely Terminator-style Digital Atlantic androids aren't perfect, but they're a great start!)
Some near-future "cyberpunk" remote-control drones and military robots would be great, too - like those robot "mules" and "dogs" that are being tested now, and humanoid robots that are in development to pull wounded soldiers out of trouble and so on... looks like there are some new Iron Core sets on the horizon, hopefully that includes a reprint or update of the accessory set that included some robot "mules", that set was great, and sorely missed now! The "mules" were maybe a bit on the big side and maybe just a bit fiddly (four legs each built from three tiny, tiny little bits was probably great for posing, but frustrating to build!), and I wouldn't mind at least some one-piece legs in an updated version, but even as-is I'd buy those accessory kits again - the sprues of ammo boxes and extra fifles and heavy weapons alone were worth the price of admission.