yes they did!
There's a new rank of most infantry, aricraft and ship techs. Also new industrial techs, a new set of plastic technologies, and a hospital series that introduces and modifies a trickle back modifier. Presumably this adds some of the casualties from combat back into your manpower pool. I for one find this particularly useful for Germany, since the only time I ever lose as Germany is when I run out of warm bodies to man my Tigers with.
All in all, I find the game refreshed and extended.