New Wikipedia gender gap research has been posted to Meta.
http://meta.wikimedia.org/wiki/Mind_the_Gap
This research was a collaborative effort of user:LauraHale, User:Hawkeye7, User:Pine, and
others.
"...This analysis will focus on characteristics of female
participants on English Wikipedia. The analysis will look to see if
these participants are representative of the female English speaking
population. The analysis will also explore, through some existing
literature and in the conclusion, the question of whether these
potential differences could matter when planning strategy to target the
gender gap. …"