It's no surprise that Gabe Aul, the head of the Insider program at Microsoft, is running a newer build than what has been released publicly. And if you are curious what build he is running, it's 10136.

At this point, the company is no longer adding new features but is squashing bugs and refining the OS and in the screenshot above, the system tray arrow has been updated to one that now matches the other taskbar icons. Also, the File Explorer icon has been updated, the current build has three tabs on the folder whereas this one only has one tab.
Gabe Aul teases Windows 10 build 10136, shows off a couple new icons

A Guy