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Since there's no forum yet for The Witcher 3, sorry for asking it here.
No problem in asking it here, since there's no dedicated forum yet!

I don't think your question can be answered right now, though... there's not really much we know about the game, spec- and tech-wise, aside from the obvious fact you'll probably need a behemoth of a computer to run it, let alone specific things like a FOV slider. There's simply no way of knowing, at this time, and even if GOG and CD Projekt RED are sister companies and, in fact, share the same headquarters, I highly doubt someone at GOG knows more about the game than your average GOGger (and the ones who do definitely can't disclose any information on the upcoming game right know). I could answer you with some speculation on my part, but it would have been just that: speculation.