User blog comment:Rappy 4187/Technical Update: October 16, 2012/@comment-3441771-20121017032152/@comment-13301-20121017200453

Well, the change is now live, and there's no way to force a subst: of the template now (using now inserts the includeonly tags "as is"), although a solution for this is to subst: the template itself on the welcome message.