In this beta version, we make a strong effort to improve the quality of ad blocking, introducing several powerful new toys for filter developers to play with.
[Added] Scriptlets support #1366
Scriptlets is a powerful ad blocking instrument. You can say that scriptlet is an internal script (a mini-program) that we install in the extension, and then execute that script with the help of filtering rules. Putting it simply, scriptlets allow us to modify how the code of the web page behaves. As for the practical use, this helps to block anti-ad blockers, for example.
[Added] $redirect and $rewrite modifiers support #1367
They are practically the same modifiers, and they allow to substitute resources. If you are not a custom filtering rules aficionado, don't bother with it. Just know that it is yet another instrument in the hands of filter developers that helps efficiently block ads.