That WAS an awesome patch. Also the patch that made the T34/85 useful. To bad they decided to rip them back from us this patch.
Pretty sure what they did was make it so people actually build t3 or t4 as soviets instead of just rushing t34/85 spam. They are still useful tanks you just can't spam the crap out of them and expect to win every time using that strat. I've been using them effectively since then to supplement my forces.
Also they didn't change the starting resources or the build times back to what they were on release for those buildings, it's still completely viable to go t1 or t2 off the start as soviet.