The Sony Xperia Z3+ which released a while back internationally, launched as Xperia Z3v in the US exclusively for Verizon. The device is the Flagship device from Sony for the mid-2015, and so is enough spec’d to get the Android Marshmallow update.
Verizon Xperia Z3v Marshmallow update can be expected to release shortly after Sony releases the update to the international Xperia Z3+ variant of the device.
Sony is pretty quick at releasing Android updates, at-least for the ones it launched only recently. We expect the Xperia Z3+ to get Marshmallow update within 30-90 days of official release by Google, that’s on Sept. 29th.
Once Sony has the Marshmallow update ready for Xperia Z3v, it will submit it to Verizon for testing and distribution. Verizon will then put the update to “test” and might act irresponsibly frustrating while doing that as it’ll keep it under testing phase for at-least a month and more.
All in all, the Verizon Xperia Z3v Marshmallow update should rollout by the end of 2015, or early in January 2016.
Expected release: December 2015 OR January 2016.