Basically you'll more easily be able to see who has re-uploaded your YouTube videos. It'll gradually be rolling out to select channels and eventually might be possible on every channel.

Copyright Match Tool The Copyright Match Tool finds full reuploads of your original videos on other YouTube channels. Once a match has been identified, you can review it in YouTube Studio and choose which action you’d like to take. At this time, we’re rolling this tool out as a small pilot.

Here’s how it works: when you upload your original video to YouTube, we’ll begin scanning all the videos that are uploaded after yours to see if any of them match. It’s important that you are the first to upload the content to YouTube as a public video since we use the video upload time to decide who should see matches. Be sure to check back regularly to keep an eye on any new matches we’ve found.

Please be sure to use the Copyright Match Tool responsibly. Misuse, including intentional or repeated abuse of the copyright removal process or attempted probing or reverse engineering of the match system, may result in loss of feature access or termination of your YouTube partnership. Just because we’ve found an upload that matches your video doesn’t guarantee it is copyright infringement. It is your responsibility to review each video and consider whether fair use, fair dealing, or a similar exception to copyright applies before you submit a takedown request.

https://support.google.com/youtube/answer/7648743