OS: Windows 8.1 64 Bit, Windows 8 64 Bit, Windows 7 64 Bit Service Pack 1, Windows Vista 64 Bit Service Pack 2* (*NVIDIA video card recommended if running Vista OS)
it does look awesome doesn't it :) and the guys at rockstar North have obviously done a good job optimising it, looking at those spec requirements.
the 65 gb is a little bit of an eye opener, but not that surprising really when you think about all the audio and hi res textures that are needed for this game.
I wonder if it will be available for download, as it states a DVD drive on the system specs. I'd be very surprised if wasn't though.