Will my progress in the Beta be wiped?
Although 15 bucks might not seem much for their patrons (for an Early Access to a game that is designed to be free-to-play), it sure would become messy if by any chance the developers would decide on wiping progress from here on.
According to the developer's official statement, there are no plans for any further progress wipes so unless in the very unlikely event that anything drastically untoward happens, then all beta players should keep all their progress.
In addition to this, they also stated: "Please note that if you are playing on the Free Trial version of the game which allows you to sample the game and then you choose to purchase the full version, your progress will be reset to allow you to experience Fable Fortune fully".