T34/85's are now 130 fuel, so you can rush them without much consequence in the latest build of the patch and making them in large numbers isn't really much of a challenge. It's a big kick in the butt for OKW because their medium tank is 5 fuel more expensive on top of the fuel penalty.
Ostheer can handle because of how cheap and easy to acquire the StuG III is on top of the fact they have an actual AT gun.
In a few days you will be getting a medium tank yes. And with the teching you need around 350 fuel to get T34-85 out. It will take almost the same time as getting them through call ins.