When everyone has really fast computers, and internet speeds become super fast everywhere, the online community of forums is going to be amazing.
I'd say around the time of version 5.0 we'll have super high resolution monitors, and seeing someone on the webcam will be like looking at someone through a window.
The sound would be great too, as if they were in the room with you.
Some features for this release would be:
* Live webcam feed as avatar (if user is online)
* Log in with thumb scan / and voice
* 200,000 different kinds of styles to choose from.
I'm sure you could think of many more.