Just that they were claiming that Maverick improves battery life, so it would be interesting to see what actual figures the first users are getting.
Spoke to Apple today, and was told that they "Presumed" it was with Maverick as that was what we would soon be using, and it gave better battery life.
That's weird, I spoke to a guy from apple today and he said the opposite, that it's with mountain lion as mavericks is still a few months away.
I could tell by her voice that she was not sure, so it was probably a guess.
It would make sense for it to be Lion as that is what buyers will be getting, which means if Maverick lives up to its billing, battery life should be even greater.
I am presuming that the increased battery time is measured with Maverick, so is likely to be less with Lion as installed at present.
Engadget's review is also out:
They measured 12 hours and 51 minutes on their standard battery test.