Much as I hate to say it we will soon be struck with a significant imbalance when it comes to tanks. I know everyone thinks that the new tanks will be hangar queens almost overnight. I do not agree. Still, if the new additions are successful enough as assault tanks to see continued use then we have an awful lot of German armor and not enough British or Russian armor (and no Japanese at all). I understand why the Japanese armor is not popular enough to get requests for any of them, but what I don't understand is why we have such a vacuum when it comes to early armor. Then there is also the lack of anything in the Tank Destroyer category that can actually kill a heavy tank (outside of German armor, again).
I read where someone requested the M36 90mm GMC, yet it was shot down as having not actually been in the war. It WAS in the war. Add it.
That said, I want to see the early war tanks like the M7 Priest, M3 Lee, Grant and Stuart introduced. On the British side the Churchill (Infantry Tank Mk IV (A22)), and the Matilda, at least. I could name many others to choose from, but all you have to do is look at the more famous tank battles of the war and you can see there are many, many tanks that have been left out.
Now, I know that the idea is to make the kiddies happy with the 'cool' German stuff, but you've done that. Now let's fill in the holes of historical events!