Quick highlights at a glance:
Armour values fixed for vests etc.
Russia, adds the PAK-FA (modern 5th gen fighter jet prototype), AS Val, new armoured car, infantry limb damage & hitpoint tweaks.
US, adds M27 and M9, F-22, CH-53E, SMAW, mortar, howitzer and TOW launchers, reload anims for UGL, a fake antirollbar to tracked vics to prevent AI flipping them randomly, Javelin can lock air, new Kimi HMDs, new lenses on all ACOGs for less scuffiness...
and most importantly...
C-130 shouldn't explode on paradrops anymore