Not this year i would say ! I mean they are still increasing the Gap to XOne and yeah the sells arent that good from last year, but lets wait until February and March, there will be a big boost again because of The Order and Bllodborne, also Games like Witcher and Hardline will help.
Then Uncharted is also supposed to come out this year, maybe to go Head to Head with Halo and then they need no pricecut.
And lets be honest, Sony really NEEDS all the money they can get and as long Xone is not selling (way) more Units then the PS4, they dont need to take action with a Price cut.
So i predict at the beginning of next Year, maybe with a new version and also 1 TB storage ! :)
But lets see what happens.....