Microsoft is pushing a new cumulative update KB3156421 for those on Windows 10 Build 10586.218 (Version 1511) currently. The update KB3154879 brings Build 1o586.318 and includes fixes and improvements to enhance the functionality of Windows 10 Insider Preview (Build 10586).
KB3154879 (Build 10586.318) Changelog:
This update includes quality improvements and security fixes. No new operating system features are being introduced in this update. Key changes include:
Improved reliability in a number of areas including Cortana, Bluetooth, Shell, Internet Explorer 11, Microsoft Edge, Miracast, and USB.
Fixed memory leak that occurs when opening a portable document format (PDF) form multiple times.
Fixed issues with text alignment for right to left languages in Internet Explorer 11 and Microsoft Edge.
Fixed issue that affected Bluetooth function when a PC resumes from sleep.
Fixed issue where user accounts weren’t locked out after a number of failed sign in attempts.
Fixed issue with revised daylight saving time.
Fixed issue that sometimes corrupts CompactFlash cards inserted into a card reader.
Fixed issue that caused recorded video to be lost when answering an incoming call on some phones.
Fixed issue that could result in unexpected battery drain while the phone screen is off.
Fixed additional security issues with kernel mode drivers, remote procedure calls, the Microsoft Graphics Component, Internet Explorer 11, Microsoft Edge, Windows Shell, Windows Journal, Virtual Secure Mode, Schannel, and Jscript.