The CollaborationKit extension will allow people to "join" collaboration hubs (e.g. WikiProjects) at the click of a button. This will help facilitate notifications and generate statistics on member participation. (Users should be able to opt out of being included in metrics reports.) Unlike the current membership feature in WPX UI, there will not be an emphasis on profiles; that feature will be uncoupled from the basics of membership.
This will be part of the initial feature set to ship with CollaborationKit.
Original Report:
A Women in Red user noted that the process for signing up for the WikiProject is too convoluted. There also isn't enough emphasis on the avatar being optional.
@Capt_Swing, might it be possible to appropriate AddMe (or whatever it's called) for WikiProject purposes? It's nice and simple.