Indeed - you can move freely from any platform to any other - PC to PS3 or vice versa as well as PC to PS4 or PS3 to PS4 and so on - just just need to (re-)purchase the game on each platform but you'll be able to still use the same sub as long as you'll register all the copies to the same SE service account and (as a benefit) for each registered copy you'll get additional 30 days of fre play time included so if you register PS3 and PC versions now you get 60 days in total and one you'll purchase and register the PS4 version you'll get another 30 days.