Selenium 4 will brings lots of new features along with changes in the existing one. If you are interested in learning Selenium you can read more about it in the following Selenium Tutorial. If you want to make your career in Selenium you must take up the following Selenium Training Course.
Some of the features of Selenium 4 are as below:-
It will have a new API for Actions class.
A new W3C standard.
timeouts() will no longer exist.
Changes in capabilities.
No support for native Opera and PhantonJS.
Changes in the grid.
Here is the video by which I came to know all about these things. .