Considering it has been predetermined that there will never be any dragons in PlaneShift, I doubt that will be the case. More likely you'll come on one day and everyone will be riding Gonrads, or some other odd name for a creature that remarkably resembles a dragon.... lol thats planeshift for ya.
I like being surprised but i think you could still have a general list of overall features that are being worked on on a status page or something. You can still surprise people simply by not disclosing EVERYthing you are releasing. Easy to say... working on improvements to the crafting system, implementing ranged units, and a few surprises as well. That still keeps people guessing.