Been playing this a few weeks earlier than everyone else and Stainless has doubled the content in the pre-alpha since going public. The foundation for a great Carmageddon is there. It's already fun and a worthy followup to their predecessors. All they need to do is polish, continue adding content (maps, cars, multiplayer, etc.) and optimize the hell out of it. Unless you have a beast of a machine you will not be able to run the pre-alpha at a playable framerate. Another year of a development is perfectly reasonable. Modding is already possible and the official tools are confirmed as part of the final package.
At this stage they have a much more solid and fun game than InXile's Wasteland 2 when they started open beta testing. If you are involved with that you'd realize how far they came in a few months time.