Given that there'll be quite a bit of short runs in the future, some of which will be suggested by you, there's the possibility that they could become permanent flavors depending on how they do before they run out. In this thread you'll find both the amount left of a short run and the chances of it becoming a permanent flavor.
Current short-runs:
Prophet's Drunken Cheesecake
Availability: Low (1-2 weeks supply left)
Demand: High
Chances of becoming a permanent flavor: Very high
Current short-runs:
Prophet's Drunken Cheesecake
Availability: Low (1-2 weeks supply left)
Demand: High
Chances of becoming a permanent flavor: Very high