Yes the advertised is seven hours. Apple gives this figure measuring the battery with 50% screen brightness while surfing between 25 popular web sites. I have had my retina display MacBook Pro since Tuesday and I am not getting quite seven hours, but I am doing more than just web surfing.
The two hours and thirty two minutes you got would be normal for certain sustained intensive iMovie tasks; or, say you were streaming a Netflix movie via Wi-Fi, brightness cranked up, all battery saving measures off you'd also only see around two and a half hours. But outside of these extremes you should be doing much better than 2:32.
I am sitting here writing this on my retina display Mac, and brightness is just under 50%, there is 54% showing on the battery remaining, and the drop down is showing 4:40 as I am not taxing the computer at all just writing and posting for the moment.