The Cobra Can name comes from the appearance of the piece - the flat-coiled perc uptube is shaped roughly like a Cobra. This piece has a detachable mouthpiece, and was previously called the DP-UFO. That name was changed to avoid confusion.
The three pieces in the "Can" series are unique designs (not copies of designs already being sold) that have pump percs of one sort or another.
There has been one exciting development with things so far. Sunshine store has already produced a sample piece of the Rattle Can! They sent a video and photo. I don't know how to best post a video, so I'll share the photo for now. The base is not wide enough in this image, and I'm requesting that be changed. I'm also asking for the top of the can to be lower, or for the joint to be placed a little higher on the can. We may have a piece available sooner than expected!