I would strongly recommend working on this based on the beta JSON files so that you can start now.
Any changes in the format for the release are likely to be extremely small.
Also, you should probably start learning as much as you can about the DB... as far as we could tell, it didn't matter for the beta, but there is some indication that the single-player campaign will need appropriate values added. I'll be happy to help with that, but my first priority is getting a rough mod manager ready for release day. (Granted, figuring out the DB may be an important part of having it genuinely ready.)
http://btmodding.warriorsblood.com/index.php?title=The_Database