As rumored, new 11-inch and 13-inch MacBook Air models have just been officially announced by Apple at WWDC 2012. Unsurprisingly, Apple is keeping pace with competitors with the addition of Ivy Bridge to its slimmest line of laptops. The 11-inch models will start at $999 with a 1.7GHz dual-core Intel Core i5 processor, 4GB RAM, integrated Intel HD 4000 graphics, 64GB flash storage, and 5 hours of battery life, with a higher-tier model for $1099 that contains 128GB of flash storage. The 13-inch models start at $1,199 and include the same 1440 x 900 display as the previous models, along with a 1.8GHz dual-core i5 processor, 4GB of RAM, the same graphics as the 11-inch model, and 128GB of storage. $1499 will get you an extra 256GB of storage; specs are the same otherwise. Apple has also opted to include a pair of USB 3.0 ports in its new Air lineup.

Apple says the new 11-inch and 13-inch Macbook Air models are available now.

Compare this: MacBook Air 13-inch (Mid 2012) vs. MacBook Air 13-inch (Mid 2011)

Compare this: MacBook Air 11-inch (Mid 2012) vs. MacBook Air 11-inch (Mid 2011)