I think the major issue is that the power gap between the 360 and PC when TW2 came out was large, like really large. So the 360 TW2 ended up looking like a ~Medium PC edition (Give or take - obviously the 360 had the new lighting and they re-wrote code somewhat, but to give it a rough average, about medium).
So here when you have the PS4/Xbone there's still a huge power gap. The gap between a 780Ti (And not even accounting for even better GPU's and SLI setups) and the new consoles is still fairly large, and then you've got the 8xx cards on the way by the end of the year and the gap will only grow even larger. So when people hear, "Consoles are running at high and PC only has one notch above that at Ultra", it makes all the guys with SLI 780Ti's raise their eyebrows.
Obviously 60FPS+, higher resolutions and overall settings flexibility/choice are a big deal, and that's a huge part of gaming on PC. Not to mention that the game will undeniably look better, I just think people get a little scared when they hear contradicting statements from one developer and another. One guy says they're trying to make the "experience as equal as possible", but then Mamais says that, "It adds Y-Z and it's possibly the peak in games"... So it just confuses a few people.. Is it PR talk to downplay how the consoles look in comparison? Or is the opposite comment true and it's actually PR talk to try and keep the PC gamers thinking they're getting a much better version when they aren't?
Previous knowledge of CDPR would say the PC version is going to be fucking brilliant and a solid leap above the Consoles (You can already sort of see this in the E3 footage - although the difference isn't as large as some people expected there I think), but I do understand how some people can get a little worried. It's not like CDPR are the perfect Devs who can do no wrong, Developers change over time (Fuck, look at BioWare) and not everyone has that overruling faith that some of us have. So I do get it and I'm pretty interested to see where the specs end up lying, because at this rate if the Consoles are running the "PC High", then my SLI 680's actually might do just fine, and I was kinda dreaming that they'd be made practically redundant by TW3 so that it was like 2007 Crysis 2.0. Ultimately the trust still lies in CDPR and I really hope it's all just PR and they truly are going completely all-out for the PC Version, but I do totally understand people's skepticism.