Game runs fine here even at highest settings, not much worse than CoP did when I last played that. The issue is the performance degradation after an hour or so of playing, it's easily a 50% drop in performance. Restarting the game fixes it completely. Really hope they fix whatever is causing it as everything else looks and runs fantastic.
My first impressions is that it's very close to the original SoC, with the obvious graphical improvements and changes in landscape. That said there is definitely a slight unfinished feel to it (as you'd expect). I'm told the maps are bigger, but at the same time everything feels less populated, there's less stashes everywhere and just a general feeling of less activity in the environment. Nothing that can't be fixed though. Really look forward to what becomes of it a few patches down the line.