Expected to be launched in early 2016, it seems NVIDIA's plan is to upgrade the current GTX 965M (N16E-GS) to the faster GTX 965M (N15E-GR) in early 2016, without switching to a new model number. There's some speculation the new card may adopt the name GeForce GTX 965M Ti, but the site claims this is unlikely.
Which changes do the new GTX 965M bring? First, clock rates are expected to be higher. The base clock is raised from 924 MHz to 935 MHz, while maximum Turbo should increase significantly from 950 MHz to 1151 MHz. This corresponds to 20% higher clock rate if the chip can maintain its Turbo overhead. With this increase, the new GTX 965M could achieve about 8400 points in 3DMark 11 and rank approximately midway between the current GTX 965M and the GTX 970M.