Overview
When you enter someones forum profile, you will see a description that can be maximum of 100 words, where you can give a short biography or share links to your social network, whatever you wanna share basicly, and everyone entering your profile will see it.
Online system
Just like in the WS forum, you can see if someone is online or not by seing hes profile where he posts. I know you can already but then you have to click into the guys profile, its easier to just see it when you see the profile.
Notification system
Whenever someone qoute your post and replies to you, you will get a notification as easy as you would get a notification for getting a PM.
Friend system
You can add, manage and delete friends, this makes it alot easier to keep control of your friends and see their updates (kinda facebook, but a cool feature why not?)
Inspiration -> LCPDFR.com/forum