Double Tap to Wake Up as a feature has been in the “most-desired and yet absent features” list for some new devices like Lumia 950 and Lumia 950 Xl, but surprisingly Microsoft didn’t enable it even with the latest Windows 10 Mobile Redstone Builds on any of these new devices. Hardware wise these devices are very capable and should support this feature with ease, but seems Battery life issues have kept it at bay.
Though Microsoft teased about this feature being under works but there has been no direct confirmation. Now, for the first time, a Microsoft Engineer has confirmed about this feature coming to supported devices in a response on Feedback Hub. Check the screenshot above.