Steam users can opt into the beta with this key: dnkrozdnstuff
Mods WILL NOT WORK with U7 beta, so be sure to uninstall all mods for now while modders update. If you have issues you could even try deleting Streaming_Assets in the game folder and the verifying the game on steam to reinstall that folder.
If you want mods and don't want bugs, you may wanna sit the beta out and wait for full release. Cheers!