I happen to have both a PC and a PS4, and think it might be kind of funky to be able to play on both systems, even if the separate servers means I won't be able to play the same character. Now, I am assuming that I would have to actually buy the game on both formats to do this, but has anyone any idea what happens as far as the subscription goes? There seems to be nothing definite so far, as far as I can see from a forum search, so does anyone have a definite answer?

You'll probably have to pay separate but I'm hoping that since you use a single account for both the PC and PS4 versions of ESO, you'd get charged the $15. But I'm just going to assume that you'd have to pay $30 if you want to play on both.

You will have to pay the game 2 times and pay 2 x sub if you want to play on both platforms.