That may be the build string of the latest version of Microsoft’s Windows Blue (8.1).
Speculation has it that this build is right in the middle of Milestone 2 and pre-beta development stage. Some are indicating that this means Microsoft are on track to deliver Windows 8.1 at BUILD 2013 this year.
Now apparently 9385 is being distributed to Microsoft Partners on the Microsoft Partner Network.
What’s new in this build? Who the hell knows but the web being what it is I am sure we’ll find out pretty soon.
Here’s a screenshot allegedly showing the new build.