Microsoft is going to make jQuery part of the official dev platform. JQuery will come with Visual Studio in the long term, and in the short term it'll ship with ASP.NET MVC. We'll also ship a version includes Intellisense in Visual Studio.
The Announcement Blog Posts
This is cool because we're using jQuery just as it is. It's Open Source, and we'll use it and ship it via its MIT license, unchanged. If there's changes we want, we'll submit a patch just like anyone else. JQuery will also have full support from PSS like any other Microsoft product, starting later this year. Folks have said Microsoft would never include Open Source in the platform, I'm hoping this move is representative of a bright future.
This is really good news for jQuery users. It means that it will just be there all the time and there will be a stable, supported reference to use when debating the reasons to use it to management.