I posted this in the Windows Forum on CompuServe earlier but it should be of interest here:
Picked up via Paul Thurrott's new site:
Windows 10 Technical Preview Update Rollup: February 4, 2015
which contains a lot of fixes and might be considered as a monthly update instead of a new build number? It comes down as a Windows Update not a new build download.
But can you believe this footnote at the end of the KB:
Update replacement information
Thus update replaces the following update: 3034229 (https://support.microsoft.com/kb/3034229/ ) Windows 10 Technical Preview January Update Rollup
which was released by Microsoft on ..... end January 2015
Will they ever get it right first time?