CyanogenMod Going for Its Own OTA Update Engine
One of the inconveniences of having installed a custom ROM on your Android device is that you will not benefit from the convenient OTA update system. Once a new software version becomes available you will have to flash it manually, using your custom recovery and not without problems from time to time.
The CyanogenMod Team is looking to change the OTA – Custom ROM policy by developing their own system of providing updates for their ROM’s. Till now, if you went for a CyanogenMod ROM and wanted to update it, you had to download the zip and manually flash it, or use ROM Manager from the Play Store to have it downloaded and flashed. CM is going to integrate a similar system that the OEM’s offer to update their devices but since the actual push notifications require Google Apps framework their implementation will only automatically check for updates at user-defined intervals, and pull the update once something is available. It has also been customized to check for stable builds, new nightlies, or all builds from either channel.
No ETA for when the new update system will actually become available.