Inmiddels staat 17134.5 er op.
Bron: KB4135051 update brings Windows 10 Build 17134.5 for Fast, Slow & RP Rings.Microsoft has today released a quick update KB4135051 for the Windows 10 April update RTM Build 17134.1. This update brings Windows 10 Build 17134.5 along with itself and is available for insiders in Fast, Slow and Release Preview rings.
This seems like a quick-fix update before the RTM Build 17134.5 starts rolling out to general public as Windows 10 April update. Microsoft just announced that Windows 10 April update will be available to download starting April 30.