Probably a day one purchase for me on PC, I'll just double check they haven't fucked it with monetisation and microtransactions first. (The previous game was exemplary in this regard.)
Also, I'd want it to be by the same people and the same chap doing the music and all that jazz.
TBH even if it's just a sort of 'extended DLC game type thing' for DOOM 2016, I'd be happy.