The stateroom reviews on wdwinfo.com are user-submitted, not written by the DIS. If you search by room number, I do see some for the Magic and Wonder, however mostly older reviews. Someone will correct me if I'm wrong, but I believe many (most? all?) of the Cat. V staterooms on the Magic and Wonder were "upgraded" during fairly recently during renovations and had previously been classified as category 4 or 5.
Here is one for 8550 on the Wonder from this past January:
http://www.wdwinfo.com/wdwinfo/cruise-new/roomreport.cfm?Room=8550
Enjoy your cruise!