Does this support wireless bridging mode?

There is a bridge switch on the back right-hand side for turning on wifi connection - but at this moment the software for using it hasn't come out. I'm running it in bridge mode using a CAT6 flat cable and it works very well.

how many users can operate off this at one time?

It can have up to 4 Ethernet connections and personally i have all 4 full with about 10 things connected to wifi on it and it runs everything perfect.. Hope that helps.