Re: when will the windows phone 10 update be released
Probably within the first couple quarters of 2016. If you think that's a wide time range, it's because it is.
The reason for the wide time range, and the ambiguity from Microsoft on a release date is because there are a variety of countries, carriers, networks, and models of Windows Phones. Not all of them will be upgraded on the same day, or week, or even month.