Dona Sarkar from Microsoft has teased two Builds coming out to Insiders in Fast Ring. The image in the tweet has mention of two builds 15047 and 15048. Windows 10 Mobile Build 15047 and Windows 10 Build 15048 may come to PC. This may be because last Build 15046 was released for only PC.
— Dona Sarkar (@donasarkar) March 3, 2017