Yeah, don't get your hopes up about a cheap devcart that can run anything. It would likely ONLY be able to run special small programs made for it.
However, you can expect that something like this will make it much easier for devs to get their code out there, since it will be a very convenient platform. Also, we're hoping the design will at least support NROM out of the box, as well as custom code designed especially for the dev cart.