According to the folks over at VirtualWeberBullet.com the Weber Stephens Company is going to introduce a new, bigger, WSM this month. The current 18 1/2 inch WSM that is 41 inches tall is great. I have one in the garage, but a new 22 inch version would even better.
I haven't seen one yet, but the new model promises many additional features that bbq cooks are going to love.
The door is supposed to be bigger to offer better access from outside the cooker and there is a new mechanism that will help the door seal tighter.