Description of features 5.2
 

What's this?

. Added support for wordpress product user login
. Added support for the new Xenforo forum product ( user login and basic style integration )

and why is it useful?

Where are these features described?

Is there a document that describes *all* of reviewpost's features?

That is addition of support for two new types of integrations as stated. Being that you are not integrated with either of those products that would not be something of concern to you I would think.