We’ve seen evidence of Google pushing Android 4.2.2 updates to Nexus devices, and now it appears that the company is in the process of pushing the update to the mainline AOSP codebase. This will eventually allow Android developers to develop custom ROMs with all the new features and bug fixes intact.
Currently, aside from the Nexus line, devices can stay up to date with the latest version of Android with CyanogenMOD 10.1, AOKP and a few other niche products, though they don’t always work without issue. For example, some versions of CM10.1 have issues with the camera or NFC, depending on the hardware. This is because AOSP code doesn’t inherently support all the SoCs that OEMs use to create Android phones.
Many of the most popular smartphones like the Samsung Galaxy S III and the HTC One X have versions of CM10.1 with few, if any, issues, but the same can’t be said for some of the more marginal models.
We’d expect ROM creators to begin incorporating Android 4.2.2 in the next couple of days, so hang tight. If you’re running CM10.1 or AOKP on a Nexus device, you can always flash back to stock and install the update manually. The build number is JDQ39.
Source: Android Police