Although Windows Phone 8.1 is not expected until spring 2014, there is already talk about what comes after the next major Windows Phone OS. This morning, Mary Jo Foley at ZDNet has leaked some new information about some updates coming in spring 2015, specifically its codename: Threshold.

When I blogged recently about Microsoft’s plans on the operating-systems front following Windows 8.1, I mentioned a couple of “spring 2015” releases. It turns out the Microsoft codename for that wave of deliverables is “Threshold.”