When it comes to Android, it is always about when the next version is coming out. Right now, most users of more new Android devices have the latest with Android version 6.0 (also known as Android M or Marshmallow). However, the latest version that was recently announced at Google I/O was version 7.0, also known as Android N or Nougat. Unfortunately, Sony is one of the companies that has a very slow rollout when it comes to Android, and this is what is known about Android M Version 6.0 Marshmallow and Android Nougat Release Date for Sony Xperia X, XA, XA Ultra, X Performance, Z5, Z4, Z3, and Z2 on T-Mobile, Sprint, AT&T, US Cellular, and Verizon.
According to Tech Radar, Google and Sony announced that the Sony Xperia Z3 would receive the developer edition of the Nougat software, but it won't receive the full Nougat upgrade. It has been reported that the Xperia Z3+, Xperia Z4 Tablet, Xperia Z5, Xperia Z5 Compact, Xperia Z5 Premium, Xperia X, Xperia XA, Xperia XA Ultra, and Xperia X Performance will be getting the upgrade.
As far as when the release date for Nougat on Sony is coming out, Trusted Reviews says that Sony is "keeping its Android Nougat release plans close to its chest". This means that is going to come out...whenever, and as I mentioned before, that could be a long time.
There have been reports that Android Nougat has been coming to the latest versions of Google Nexus devices, and it will be coming to the LG V20 first. So what will be the first Sony devices to receive Android Nougat? Chances are, it will be the Sony Xperia X devices first.
Given that the newer Android devices receive the upgrade first, it will probably happen in this order: Z5-branded series (Z5 Premium, Z5 Compact, and the simple Z5), then the Z4 tablet, and the Z3 series. The Z3 series is pretty popular, so it would not be surprising if Nougat comes there. Sort of like how the Z1 series won't be getting Marshmallow, it will be unlikely that the Z2 will get Nougat. Of course, it seems like Sony is always the last to get the latest version of Android, so there is no release date for Nougat.
If you are a Sony user of a newer device in the United States, your best bet is to see if you can't get the OTA (Over The Air) download of Android Marshmallow now. Just go into the "Settings" and "System Update" to see if the upgrade is available. The upgrade may not be available depending on your carrier like T-Mobile, Sprint, US Cellular, AT&T, and Verizon. Feel free to leave a comment here saying whether or not you received your Marshmallow on your Sony device, as well as what carrier that you subscribe to. The same will apply with Nougat, but it is going to be interesting how that works out.