Lmao; no they most definitely needed to say unlocked framerate. If they had locked it to a framerate of 60 most PC players would be pissed because that renders high refresh rate monitors useless. The vast majority of games on PC have unlocked framerates, and the few that don't typically are shunned.
i'm sure 4000 pc's won't have an issue at all; the top 1% of the TOPPEST most 1% will probably not care one way or the other, but for the other 98% of the AVERAGEST 98%; it's gonna be bouncing around like crazy without the latest GTXNividia series
Not even, unless the game is just highly unoptimized; which while this is a possibility it is unlikely given that a GTX 1080 runs it at a locked 60 at 4k medium settings, at least according to the press at the reveal. So with that in mind it is pretty safe to assume that the most popular and widely used discrete GPU, the GTX 970, will easily lock to 60 at 1080p.
Unlocked framerates on PC mean something completely different than on a console. On a PC if your framerate fluctuates too much you can simply lock the framerate yourself with Rivatuner or even in the video driver itself. This is just another reason why unlocked framerates are important for PC games.