I really cant say. Releasing an item for sale takes so much infrastructure so even once its done it could take a while before I'm ready to sell it. I'm almost done assembling and testing and its all working (whew!!!) but I have found a handful of changes that have to happen which means a whole new board order and set up fee ($$!!) 
I May just end up selling PCBs for this one and let people do everything else themselves. That would be SO MUCH EASIER than selling kits or assembled units but not nearly as cool!
I also really want to figure out the stacking control shield stuff before I sell anything though.