Vodafone has confirmed it

Vodafone has confirmed it will offer the handset with the OS, with pricing to be announced “soon”
Motorola has announced all Moto G handsets are now ready to be upgraded to Google’s latest operating system, Android 4.2.2.

The device was unveiled by Motorola on November 13 and went on sale in the UK mid-November but the Android 4.2.2 update only became available on the smartphone yesterday (January 7).

Vodafone, which currently does not stock the device, has said it will offer the updated version but has declined to say from when and how much it will cost.
O2, Phones 4U and Carphone Warehouse already offer the the Motorola Moto G, which has a 4.5-inch screen, five megapixel camera and costs around £130 SIM-free