It doesn't happen all the time, but it's not so rare that we're shocked to find an unannounced chip supposedly making its way into a very announced laptop. The Acer Aspire One 721 originally launched with the Nile line of AMD processors, which are said to offer better performance and battery life than their Intel competitors. The Aspire One 721 is able to play back HD video, and it has plenty of performance under the hood for quick operations. However, with the upgraded chip, it looks like the laptop could get even better.
The new, upgraded version of the Acer Aspire One 721 is listed on a product placement page, but only in the Czech Republic right now. The listing has the Aspire One 721 featuring an AMD Neo K145 CPU. As far as features for the chip go, it seems to be pretty similar to the K125, however the total clockspeed of the processor is 1.8GHz, and not 1.7GHz. It also features 1MB of L2 cache. As far as total power draw, it's listed at 12W.
As far as the rest of the laptop goes, none of the features have changed. It still has a 11.6-inch display, with a resolution of 1366 x 768, GB of DDR3 memory, a 6-cell battery, and integrated 802.11b/g/n WiFi. There's also a 1.3MP camera, and Bluetooth connectivity.