It is possible that the 22 in the photo is a one off or it might be a similar color that was released overseas.
I don't have screen shots of it, but I have heard that there was a Spring Green WSM seen in the background of another one of their grill master's instagram posts. Unfortunately I am not sure anyone got a screenshot of it before it was deleted. Again, that could just be a one off, a test model, or a sign of a release. Hard to say if these mystery kettles are in the photos on purpose to see if it sparks interest or simply by accident. We are kind of in new territory these last few years with Weber actually looking to release different colors in different models. I am kind of afraid of the cost of a Spring Green WSM. I don't really need it, but if it were a 22 it would be tempting when I have the 22 kettle in the same color. Guess we will see.