Sony doesn't have a huge presence in the US despite making a boatload of phones. Still, if you've got one, odds are good that you'll be seeing an Android 5.1 update in the coming months. The update will hit all Z series devices and a few of the mid-range models too.
Sony is continuing its odd support for modifications and software based on Android's open source core. Today they're releasing a collection of flashable recovery partitions for some phones - technically these count as "custom" recoveries, but they're based on AOSP, and therefore pretty close to what you'd find on Nexus devices. Sony's intro video does state that the recovery can restore data, flash custom ROMs, and boot to multiple ROMs, something that most stock recoveries can't handle.
Sony's Live on YouTube app, which allows you to offer live streams from your Xperia handset, has updated to bring more devices into the fray. First off, sorry, but this is still Xperia-only and is likely to stay that way. The other key feature addition is the ability to broadcast in full HD when the camera and local upload speed allows it.
Sony is making it easier to get AOSP ROMs up and running on its flagship devices with a few goodies for developers. After showing off stock Android 5.0 running on the Xperia Z3 recently, the company has posted source code and binaries for the Xperia Z3, Xperia Z3 Compact, Xperia Z2, Xperia Z1 and Xperia Z1 Compact.
Sony's back to its AOSP tricks, working to release some functional (if not exactly ideal) versions of the latest release of Android based on open-source code. This time they've quickly put together Android Open Source Project builds for the flagships of the last two years: the Xperia Z1, Z2, and Z3. You can see the bone-stock builds running in the video below.
As always with Sony's developer promotions, these builds aren't intended for end users - they aren't provided with any kind of promise for reliability or functionality.
Sony's relationship with "pure" Android is an interesting one. As a company they generally make it easy to root or otherwise modify their phones or tablets, with a few notable qualifiers. The AOSP for Xperia project, which provides the basic tools for building standard Android ROMs on popular devices, is also one way that Sony stays relevant for those who buy phones with the intent to add aftermarket software. Today it gets two new flagship options, the older Xperia Z1 and Z2.
When Sony debuted the Live on YouTube app last month, we wondered if compatibility would extend backwards to some other high-end Sony phones. The time is now, Sony smartphone owners... at least if you own one of three very specific models. Last year's flagship the Xperia Z1, its slightly smaller brother the Xperia Z1 Compact, and the high-powered Xperia ZL2 (which is only available in some Asian markets at the moment), all have access to the app as of now.