There is no "final" version of the game, it will always have regular content updates in the near future
As far as BETA goes, we're considering having maybe 5 or 10 or each level genre in the BETA to allow users a "taste" of the game. Still discussing among BEGCC ranks and i'll have info for the website later this week.
Thanks to the anticipating fans, MBF Beta has reached over 100 subscribers within a 48 hour period. Congratulations! I'm glad to see that so many are interested in what started as a "Wouldn't it be cool if..."