I'm just going to wade past all of the historical technobabble of what is what and when what was used where.
In the gameplay sense of things.... that is in RO2.... one of the advantages the T34 was to have against the PIV was it's speed/mobility
In a similar sense, the T70 is supposed to also be a bit more zippy than the PIII, thus an advantage in balance to the PIII's bigger gun or better armour.
The problem is and always has been this:
In very few of the current RO2 maps can the T34 or the T70 actually use this speed to its advantage due to small map sizes or too many objects/debris in the way. If they can get up to speed, it's on maps that are pretty wide open and they can still be leaded and picked off with a couple of rounds from a great distance away.
Gameplay-wise, I've never noticed much of a huge difference in the T34's speed compared to the PIV's. The T34 accelerates a bit faster and I do see the speedometer move a notch higher than the PIV, but it's not really anything to write home about.
New vehicles are always a good thing in my books, but exactly how are the T70's and PIII's going to be balanced in the game?
Perhaps "Balanced" isn't the right term..... How are they going to "Function" in the game against each other?
I believe the devs designed the T34 and PIV to be that the PIV was packing more punch and had better armour than the T34 while the T34 had speed and a few other options to its disposal.
Now we are going to have the PIII and the T70 where it seems as though the favor still leans towards the Germans having more armour and firepower than the Russians.
The Russian's troop transport carries 4 passengers, while the German's half-track is scheduled to be able to carry 6 in an upcoming patch.
And with the Russian's still stuck with the DP-28 against the German's MG-34, and now the Germans will be getting the MG-42, I don't see much coming along to help with the "I want to use the German's cooler, better stuff" attitude in the game.
Adding the PPSH doesn't really help balance out the "Cool Equipment" factor.