I'm not sure if it has been asked/answered already. I currently mainly play on PC, but have just upgraded my PS3 version for the PS4 as I'll be getting my sweaty mitts on one next week.

So my question is, with Heavesward only a few months away, will I be able to play the expansion on both my systems with just the one product code, or will I have to buy 2 again? Because that would suck!