I'm not sure why you're asking or what new features you'd like them to take advantage of, but given PHP's reasonable approach to backwards compatibility, I expe

I'm not sure why you're asking or what new features you'd like them to take advantage of, but given PHP's reasonable approach to backwards compatibility, I expect that it won't take too much effort to get Wordpress running on PHP 8, but obviously it's not going to utilize much of the new stuff that way.