Coils??? Hell, it could Constrictor... doubt it, but hoping for Dynamo... or Titanium Man.
I would like to see more than one teched-up bad guy... like a small group that attacks Stark (Mach1 as opposed to the Beetle, Spymaster, Whiplash... maybe even HE), then later it all escalates to a confrontation with Dyanmo after Hammer does a big reveal... something about an arms race "Tony, didn't you think others would see what you have done, and try to catch up??? You may be a step ahead of the rest of us, but we are right on your heels. Its an arms race all the way. Now, you may be the genius inventor, but I have found me a real pilot to operate my suit. It is good to know that all the cold-war Soviet MIG training isn't going to be wasted..."