Our website is updated on every version change, the last of which was 26 days ago now. The props you're mentioning here will be new in the next version of react-instantsearch. We're working on a system to get beta versioning into place, but as you understand, it's very important that we don't break things, just because we want everything to be as new as possible.
The new props will be released in the next version for sure though, so keep your eyes out for that!
Have a nice day!