This means you can opt-in if you want to help test it, otherwise things stay as normal and your version of Switch 'N' Shoot remains unchanged. If you want to get a preview of the new version, the steps are below.
This is currently available for Windows users only, but Mac and Linux versions are coming soon.
Please remember that this is a beta, so it may contain bugs. If you find any, please report them to me by leaving a comment anywhere on the Steam page or on Twitter!
1. restart Steam if it's already running.
2. right-click Switch 'N' Shoot in your game list and select "Properties".
3. go to "Betas" tab.
4. from the drop-down menu, select "public_beta".
Steam should then download the new version automatically.
If you change your mind and want to revert to the main branch, follow the same steps but in step 4 select "NONE" instead.
I'll post a full change-list when this version goes fully public, but the main changes are:
Enjoy!
- Matt