Sorry, there will be probably no more areas added during beta (and Larian said that they will NOT release the whole game for beta testing)
Then they better test the shiznit out of the rest of the game themselves. I actually understand why they don't wanna do it. Some not so nice backer can pirate the game out to the internet and it will affect the retail sales which game has a good potential to sell very well. So it's understandable. I'll sit for release though. Alpha testing Elite: Dangerous right now anyway, so it's prolly for the best. I wouldn't wanna miss DOS full content even in beta, but I am too hyped about ED right now. So it's all good.