Wikia has opted to roll out the new look without providing much documentation or transition time. Please bear with us as we learn the new skin and customize for Lostpedia. The theory tab extension does not work with this skin. If theory pages are still needed, then I suggest we work on a page banner, or infobox link where they are still required. Please report any bugs or issues here that you need corrected in the site CSS.
Update - apparently this isn't the default yet.