Just a simple list of all the missing T series medium tanks from T20 to T25E1.
T20E3:

Near identical to T20 in-game, except with torsion bar suspension.
T22:

Near identical to T20 in-game, except using M4 Sherman transmission and mounting early HVSS.
T22E1:

As above, except with autoloading M3 75mm gun capable of 20 rounds-per-minute.
T23 Pilot #1

Hull similar to T20 and T22, except with VVSS suspension and electric transmission. Turret is welded instead of cast.
T23 Pilot #2

As above, except with turret of T20 and T22.
T23:

As above, except with new improved turret (later fitted to Sherman).
T23E3:

As above, except with torsion bar suspension.
T23 (HVSS):

As above, except with HVSS.
T25 Pilot #2

This is actually the T25 Pilot vehicle that had the stabilizer removed. Gaijin should split the existing T25 into 2 vehicles (the models wrong anyway with features from both).
T25E1 Pilot #1

Similar to T25 Pilot #2 except with torsion bar suspension and cast hull.
T25E1 Pilot #1 (T14)

As above, except with 2 .50 cals and T14 90mm gun.
T25E1 Pilot #13:

Different vehicle, near identical to Pilot #1 except with range finders.


