Ohhh. Thanks, roller.
I referenced the photo on the news post. So, as I said - sorry for the confusion -- on my part...
(you guys have to be sick of me making these mistakes by now, huh? I feel bad.)
But, I know this -- supplying a 4th axis in kits is a development effort that is at the top of the list. But so are about 3-4 other efforts so I'm not sure which will be making their debut first. It probably won't look like the one in the picture. But in the meantime, you could search eBay or Google for a rotary axis motor. You can also use a Nema or other make and model to build one custom to your needs, just don't forget to pickup the right motor mounts and a general spring-loaded tailstock.