They obviously have their own prototype. They wouldn't be where they are without one.
Producing a prototype fit for market viewing is a whole different thing, and they might as well not release one until the proper model is made because it will be scrutinized through the ground even though its a prototype.
One only has to look at how alpha's and beta's are looked at in the IT world to know it's typically not a good idea.
They have bigger fish to fry than to satisfy day traders and short term holders. The sooner people realize this, the sooner they'll understand how IOT operate..