Even putting aside concerns about openness, the mere fact that they are talking this early about an app store is evidence that they're not focused on delivering value. Apple did not start talking about an app store for iDevices until they had millions of satisfied customers. I mean, why not use the Mac App Store? Maybe they have a good answer to that question, but if so, they should tell us what it is.
As long as the platform remains open to hackers, perhaps an app store is a good thing for something like this.
There's nothing more infuriating than a cool piece of tech with half hearted vendor supplied software that requires lots of kludging to use outside their thinly defined parameters.
An app store done right could encourage creation and easy distribution of novel uses if the kit to the non-hacker community.
Actually the appstore itself is not "open", as in Google Play is proprietary. Unless by open you mean anyone can submit an app. But parent said "how open the software is".