Windows 10 Mobile build 10575 might come to insiders early next week
The Build that may or may not be Build 10575 will be directly upgradable.
Gabe Aul has confirmed this in his blog post about the Build 10572 too.
Rest assured, if you’re on 10549.4 or an earlier build you’ll be able to upgrade to 10575 (or newer) once it’s out. So if you want to wait for it, we completely understand and it won’t be too long.
Next week may be exciting for not only those on Build 10572 but also for those on Build 10536 and Build 10549.