Besides waiting for news, many brothers are sharing the same question: when will I be able to use it? According to the WPCentral site, you will experience Windows Phone 8.1 Developer Preview since April 10 (which falls on Thursday), ie about a week after the 2014 BUILD took place. This version includes the fully developed core plus the latest known patches within Microsoft as " Quick Fix Engineering (QFE) update # 5 ".
If you don't know, Developer Preview is a program that was first released by Microsoft at the end of last year. This program will allow users to update their device to the latest Windows Phone without waiting for the network, nor waiting for the hardware manufacturer's update. All you need is to register a developer account on the App Studio page, then you can run Microsoft's own software to upgrade your device.