Asus was sure to hold true to their “Q2 Promises” with the rollout of Android 4.2.1 to MeMO Pad Smart 10 owners. The build is identified as V10.6.1.15 and is about 500MB in size. The main feature coming to this is multiuser support. Outside of that, it is mainly comprised of the basic 4.2.1 features, and performance enhancements and improvements.
Conversely, this is a United States exclusive at the moment. There is no word on whether or not the international community will see V10.6.1.15 any time soon, if at all. For you lucky ones, the download is available for download directly from the ASUS websites. Word of advice to the international community, I would start looking for the closest available Cyanogenmod builds available until ASUS comes around.
Download: ASUS
Source: Android Police