It will make a little difference going to Pascal. According to foxcon rumor analysis it makes a 20% gpu difference. Remember the tegra is already a die shrink of maxwell down to 20nm. Pascal is 16nm. The bigger impact of the foxcon rumors are true is the massive cpu increase. Cpu will be more important since it's easier to port games that already have enough cpu power to run your game and just adjust graphics down than it is to try and make your game work on a cpu that can't handle it.