For 2011 the KH26 comes with a Maxxis Ardent 2.6 (KH Gear Update - 2011). I believe the Stout has been discontinued and that may prompted the change.
The "official Muni Tyre Review Page has a lot of good info. As well as Tire widths on wide rims.
If you have specific tires you want to compare you can find detailed specs compiled by one person here: http://mtbtires.com/site2/tire-specs (they are spread over multiple tables so you have to search for the tires you’re interested in and compare the numbers).