Windows 8 build 8056 (fbl grfx dev1)

This build leaked on 2015-09-19 and was leaked by osbetaarchive.This build lacks Start Screen but it does have a new OOBE.

MetroFetro has released a start screen unlocker, containing a shsxs.dll for this build(apparently a modified 8102 version), it unlocks the entire Metro interface, including the start screen. Apps included:
 * Immersive Remote Desktop Connection
 * Immersive Control Panel
 * Immersive Store.
 * Immersive IE (according to Lukas it won't work with 8102's shsxs)

Interestingly, changing the color of start screen already is possible, unlike 8102.

Metro UI
This build still uses the start button from Windows 7, however when the cursor is placed in the lower left corner, the charm bar appears. The charm bar is not exactly the same as the one from 8102. When the Share option from the Charm bar is chosen while on start screen, it will display "MoGo can't share this, but Windows can share a screenshot instead". This clearly proves that MoGo was the codename for Start Screen.