Just recently to internet leaked photo of new M1A2SEP v.2. As we can see tank was equipped with new better placed RWS CROWS-2, it is easier for TC to reload it and it don't obscure his vision from vision blocks as much as older CROWS did. The most interesting thing are these welded plates on turret and hull front, these are weight simulators. US designers allways install them before new armor package is installed to see how weight will be distributed and gather other important data. US.Army plans to upgrade all it's tank fleet to two variants, the M1A1SA and M1A2SEP and starting from 2013 new deep modernisation plan is schedulde. http://www.fas.org/man/dod-101/sys/land/wsh2010/16.pdf http://www.fas.org/man/dod-101/sys/land/wsh2011/16.pdf https://www.g8.army.mil/pdf/AMP2012_lq.pdf The last PDF mentions only quantities of M1A2SEP's and M1A1SA's in fleet, quantities of older variants in the fleet are not mentioned but fleet overall quantities is something around 8000-9000+ M1 tanks for US.Army, ARNG and USMC.