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You can check http://blogs.sonymobile.com/ for official information about android upgrades
Last official statement (July 2013)
Hi everyone, a quick note on our software roadmap…
So, Sony’s Jelly Bean 4.2 upgrade for Xperia Z and Xperia ZL is well underway* – next up, Xperia ZR and Xperia Tablet Z will start receiving 4.2 from early August.
Yesterday you probably saw Google announce the next version of Jelly Bean (Android 4.3) – we’re already getting stuck in and can confirm we’ll make 4.3 available for: Xperia Z, Xperia ZL, Xperia ZR, Xperia Tablet Z, Xperia SP and Xperia Z Ultra…
We’re also looking at uplifting some of our other devices running 4.1 direct to 4.3 – we’ll share more info / deets / timings when we can, so be sure to follow @SonyMobileNews for all the latest.
So your Xperia E isn't in in the official list of devices that will receive a new android version.
No ,they're done with E (99% sure)
were lucky even to get an update out of sony,
(if the phone dosent have a "Z" in its name, its rare for sony to even talk about it)