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i've read news on SONY blog about new upgrade for sony device to JB 4.3 and KITKAT.
but there isn't upgrade for xperia M,
can you give me a list of device that will be upgrade to JB and kitkat.
I have read in various blogs that Xperia M Dual (C1905) is getting released with a 4.2.2 firrmware.
Will C1904 also get a 4.2.2 update anytime soon?
http://technosamigos.com/sony-android-4-3-jelly-bean-update/
That should answer your question mate. Its expected to be 4.3 for Xperia M in Q1 2014. 
No informations?
M dual C2005, C1905 is Xperia M
Today i got a new pronounce of Sony for upgrade Android OS to 4.3 and 4.4 for Xperia. The Xperia 2012 model include Xperia T, Xperia TX and Xperia V* will have 4.3 and the Xperia Z, Xperia ZL, Xperia Tablet Z, Xperia Z Ultra and Xperia Z1 will have 4.4, I don't find my Xperia M on this list. Why? I check and compare M with many other smartphone from Samsung, HTC, LG, it have a bad hardware than Xperia M but have a long support timeline while Xperia M have a good hardware for high version of Android but only have one firmware at 4.1.2. This is a model near the end of serie Xperia 2013 (release August 2013). Anyone can give me a reason why M don't have a newest version of Android?
This is a pronounce of Sony: http://blogs.sonymobile.com/2013/11/07/on-jelly-bean-4-3-kit-kat-4-4/
It probably has to do with Sony's focus on mid and high end phones