Microsoft released Windows 10 for PCs Insider Preview build 14271 to the Fast ring earlier this week. This video goes hands on with the new build, also showing off the features from build 14267.
Build 14271 RSS
Microsoft released two new new Insider builds to the Fast ring today. Windows 10 Mobile build 14267.1004 fixes an issue with Lumia 550 and Windows 10 for PCs build 14271 has other fixes.