Do you think it will be 12 hours like the mba? Although the retina screen and processor will eat more juice compared to the mba, they can fit in a larger battery to compensate. Or do you think it will be more like 10 hours? I would totally get the MBA right now if it weren't for the lack of retina. I am not sure if I should wait for the rMBP...I have a lot of school/work related books on pdf that I read on my computer and retina would be nice but dunno if I should wait till october or whenever they release it.