It looks like Sony is reshaping the naming strategy for their new Android phones next year. We have word of a new phone codenamed "Odin" that will be their first flagship for next year. Here's a quote with more details on their internal naming strategy:

First, gone will be the ST/MT/LT branding used to describe Sonyís devices right now. Instead, there will be a five-character alphanumeric model name. For instance, itís expected that the new Sony flagship, the Odin, will carry the C650X brand name.

There are three versions mentioned in the User Agent Profile.

UAProf for Sony C650X ĎOdiní

Mozilla/5.0 (Linux; U; Android 4.1.1; en-us; C6502 Build/10.1.A.0.211) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30
Mozilla/5.0 (Linux; U; Android 4.1.1; ja-jp; C6503 Build/10.1.A.0.168) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30
Mozilla/5.0 (Linux; U; Android 4.1.1; sv-se; C6506 Build/10.1.A.0.201) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30
This basically means that ll of their new phones will come with Jelly Bean from the factory. It will be interesting to see if they can get competitive with their devices again, and if this new phone will live up to the name they have given it. They always have elegant and functional designs. They just need to market themselves better.

Source: PhoneArena