From my understanding, they are releasing a developer edition out of courtesy/respect for the mp3car.com type enthusiast. It's kind of like a startup business making it big and then going back and performing discounted work for the people "who helped along the way"/"inspired us" etc. It's a nice gesture, but not their ultimate business model nor a requirement.
If you are interested in developing on top of the StreetDeck platform, and are looking for support with the product(s) you are developing, I would suggest doing what most developers do with the source company: establish a contact, conversation and relationship with the guys over there. This way, if they are interested in a relationship with you, there are understood expectations re: support (eg: an SLA). Not only does this allow them to better serve their serious outside developers, but it avoids them having to take on a blanket statement of "yeah we will support developers on their personal machines (with their personal problems) all over the country who may or may not know a thing about programming (let alone programming in our proprietary development framework) but want to get in on the action because [insert reason why you want to be a developer here] but 1. may not finish the product(s) they are asking us support questions on 2. may be infringing on a future development idea of our own 3. may be infringing on an existing patent/etc of someone else" 4. 100 other reasonable reasons.
Remember, this is StreetDeck & MP3Car, not Intel or MS.