Despite being a beta patch, the patch has a lot of content. Patch notes start with a new content. The update adds a new map and a new gameplay mode. Also, the developers have updated the Play of the game feature and added a new feature named Highlights.
Other than that, patch notes are filled with improvements to the existing content and many bug fixes. Of course, the update contains a lot of balancing. Check this link to know more about the recent Overwatch update.