Microsoft last pushed Build 15007 for Windows 10 Mobile and Windows 10 PC to Windows Insiders in Fast Ring. However, the company has already started testing new update for Windows 10 PCs and Mobiles.
Windows 10 Insider Preview Internal build 15010 pic.twitter.com/IJEfTDqzZk
— Necrosoft Core (@NecrosoftCore) January 15, 2017
Now, a leaked screenshot hints about the Build number for this preview build. As per this leaked screenshot Windows 10 PC / Mobile Build 1501o may be the next. This build is not yet listed on BuildFeed however.