User blog comment:Kirkburn/Technical Update: April 23, 2013/@comment-4839035-20130424173259/@comment-3030984-20130424174135

Per Bert, it's a phased rollout. It will eventually be on all wikis.

If you don't like something about the new layout, don't just say it's ugly - that doesn't help anyone. Explain the issues you have with it, and how you think things can be improved.