The priesthood presides over all the organizations and auxiliaries of the Church of Jesus Christ of Latter-Day Saints. That includes the Relief Society. However, each organization has its own presidency. So the Relief Society has a president and 2 counselors, just like the Primary organization, the Young Men and Young Women's organization, etc. In the last General Conference they released the Relief Society president and her 2 counselors (Bonnie D. Parkin, Kathleen H. Hughes, and Anne C. Pingree.) They called as the new Relief Society president Julie B. Beck (formerly the 1st counselor of the Young Women organization), Silvia H. Allred and Barbara Thompson (who is single.)
So, no, the women weren't ousted and the men didn't take over.
Was that a change for the Relief Society? I had the impression that they were more autonomous in times past. Again, I can’t quote a source for that, it’s been a while since I heard that.
I love our Church.
Women of Faith in the New Testament
BYU Education Week: Mary Jane Woodger
visual
http://byubwmv.byu.edu/edweek/2004/mwoodger04.wmv
AUDIIO
http://www.byub.org/edweek/2004/asx/mwoodger.asx