There isn't a hard date, but rather it is based on number of tickets sold. Based on the current rate of sales, another 2-3 weeks or so would be a good estimate. We've sold more passes than any previous MACNA at this point in time. The next price jump will be $109, eventually topping out at $179 next year.
Hope that helps.... and as with all MACNA's, the earlier you purchase your tickets, the lower the price.
-Rob