This is probably to fix a few lingering bugs from the last patch. The Onyxia patch was pretty bad. Most servers were offline for most of the day. For those few able to connect they had an assortment of oddball glitches. The one I remember vividly was trying to vendor trash and getting no response, then when I finally saw the vendor's inventory I was disconnected.
"Hard times create strong men. Strong men create good times. Good times create weak men. And, weak men create hard times." - Those Who Remain by G. Michael Hopf