Some hotfixes for users of the Windows 10 Technical Preview Build 9926 are pushing out today for Internet Explorer security and to help prepare for the next build. Microsoft's Gabe Aul has detailed the news via his Twitter account, and they should be available right now or very soon.
"New hotfix going out to #WindowsInsiders running 9926 today: KB 3021952 - IE security rollup: https://support.microsoft.com/kb/3021952"
"2 more hotfixes going out to #WindowsInsiders running 9926 today to prep for next build: https://support.microsoft.com/kb/3040021, https://support.microsoft.com/kb/3038930"
Of course, we don't know when the next build will be here, exactly, but if you're on 9926 then you'll be needing these. Find out more at the links below.