Since the setting of the game is 2017, you think a module will be feasible which includes the M1A3 Abrams or the Russian T-99 (Armata) main battle tanks? They are supposed to be on the field by 2017 or before according to their respective pages. I know budget may seem like it may be cut anytime on new weapons, but according to the M1 Abrams page "With the budget compromise of December 2013, the M1A3 program is expected to receive funding needed to begin full-scale production in 2018." Not sure about the Russian one, though.
I'm sure the M1A3 will look the same as the M1A1/M1A2 model-wise, so just a stat adjustment without the need for new model.
M1A3: Under development, with prospective prototypes by 2014, operational by 2017.[82] Improvements are to include a lighter 120 mm gun, added road wheels with improved suspension, a more durable track, lighter armor, long-range precision armaments, and infrared camera and laser detectors. A new internal computer system is also desired, with current wiring replaced by fiber-optic lines that could decrease weight by some two tons.[