Really? Lets look at the latest releases...
Mountain Lion: Lots of issues until 10.8.3... 8months
rMBP: Screen ghosting issue, noisey fans... 4 months before
MBA 2013: Wifi, screen flickering... 1.5 months
So as you can imagine it's a guess...
New cooling, new mobo, new Haswell SoC, new OS... go ahead be my guinea pig...![]()
there's always something new in every refresh, some can be fixed with simple update ... others , well ... there is a reason apple has 14-day return policy isn't it?