This is a point release with bug fixes and a language update. v12.0 was a significant upgrade that includes updates to various packages and use of .NET 4.5.1, as well as MVC 5.
A few months ago, Microsoft introduced something called a WebJob in Azure. It's essentially a "thing" that can run as a background task to do "stuff." The reason this is cool has a lot to do with the way you would do this sort of thing in the pre-cloud days.
[Repost from my personal blog.]