It was just released this morning. The release notes and download are available on RIM's website.
For those wanting to download, click here:
https://www.blackberry.com/Downloads/entry.do?code=A8BAA56554F96369AB93E4F3BB068C22
Select BlackBerry Desktop Software 4.1 from the drop-down and then download.
..or maybe this link will work.
https://www.blackberry.com/Downloads/download.do?code=A8BAA56554F96369AB93E4F3BB068C22& dl=6A73AF0BD7902042019468C77311729E