Both Google and Samsung are switching to monthly on the air updates to address security concerns, especially following the discovery of the Stagefright bug. [theregister.co.uk...]

Potentially, it could have infected over 900 million devices, had the bug not been patched. I've already received an update on one of my phones, but not on another.

[officialandroid.blogspot.com...]

[global.samsungtomorrow.com...]