User blog comment:DaNASCAT/Technical Update: September 11, 2012/@comment-3030984-20120911173428/@comment--20120911231344

Eladkse,

Yes we can confirm that this is happening and that this is a permanent design change. Wikia is examining the current width of all the modules in our skin and will be doing some further adjustments over the coming month or so to make things fit more within a "grid" design that makes future developer both easier and more aesthetically pleasing. Consider the slight change in Message Wall and Forum rail width a dry run.

We will be drawing the community's attention to the bulk of these upcoming changes with more rationale and details within the coming weeks. Please do not read this as "we are redesigning everything", these changes definitely fall under more of the "tweak" category than anything else. No need to get too worried! :)