Christoph Wickert announced in the WG meeting yesterday he's stepping down due to lack of available time:
https://lists.fedoraproject.org/pipermail/desktop/2015-February/011612.html
So this leaves us an open seat to fill. I am planning to write a blog entry on it to encourage interested people to volunteer. The WG is responsible for selecting an appropriate candidate. If you know someone well suited, talk to them and let us know via the list.