I've been informed that my VPS is being moved to a new data center.
This VPS hosts the wxWidgets svn server and trac, the wxPython website,
wiki and buildbot, and a few other services. The downtime is supposed
to be occurring in "a window of time from 22:00 UK time on 17th of
September 2013 and 06:00 UK time on 18th of September 2013."