The 10.8.2 includes new graphics drivers. Safari responsiveness on complex websites has increased dramatically, previously I would see around 20-30 fps when continuously scrolling on TheVerge, now its more like 30-40 fps. Facebook is still a bit laggy, bit this is because it dynamically loads the content as you scroll. Before any of you naysayers come with 'placebo', yes, this is objectively tested using Apple developer tools. Didn't notice any other difference so far.
P.S. They also appear to have fixed the sleep issue - resume from sleep is now near to instant. That was my biggest gripe with the rMBP.
P.S. They also appear to have fixed the sleep issue - resume from sleep is now near to instant. That was my biggest gripe with the rMBP.