One thing I have noticed in these early reviews/previews/leaks is no mention of any overclocked refresh rates above the rated 144Hz, unless I'm much mistaken.
The equivalent LG model, which will be using the same panel, overclocks to 160Hz with no reduction in quality or even 175Hz if you want to put up with chroma subsampling.
Of course, whilst the panel will be capable of this, it's the G-Sync module that's responsible for the actual overclocking and the rumours of a "new" module combined with the lack of any mention of overclocked refresh rates has me worried this could be pinned at 144Hz only which isn't that big a jump over my current 120Hz 34".