With Apple's big OS event just days away, MacBook Air refresh rumors are hitting hard. According to Cult of Mac, Apple will unveil 13.3-inch and 11.6-inch models, along with a 50% bigger battery, a much lower price, and more. Details!

A MacBook Air refresh has been a long time coming; Apple's ultraportable notebook has seen its competitors get lighter, faster, and cheaper at an alarming rate. Improvements in the new model include up to 10 hours of battery life, a "boxier" design (think iPhone 4 versus 3GS), upgradeable RAM (starting at 2GB) and SSD drive, NVidia GeForce 320M integrated graphics (like the current MacBook), and "considerably cheaper" pricing—possibly as low as $1000 for the netbook-sized model and $1100 for the 13-incher. I'll believe that when I see it.

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The MBA's also expected to have two side USB ports and an SD card slot for expandable memory, along with a Mini DisplayPort adapter and a straight MagSafe power plug.

One area that's still in contention is the processor; Cult of Mac seems to think that the MacBook Air will house a 2.1Ghz Core2Duo, which would be surprising given the availability of ULV Core i5 and Core i7 guts that seem like a perfect match. [Cult of Mac]