Looking at the trend of the earlier previews like Cyan, Denim etc, once the technical preview which was a RTM build was released, approx 5 to 6 months down the line the OTA is available.
Looking at Windows 10 which is just a Technical Preview and not even a BETA, its going to take a long time and I don't expect the official release as an update OTA to go live before 2016. It will come out on new flagships or handsets may be late 2015 but not as an update.
Looking at Windows 10 which is just a Technical Preview and not even a BETA, its going to take a long time and I don't expect the official release as an update OTA to go live before 2016. It will come out on new flagships or handsets may be late 2015 but not as an update.