Just looking at this for one of the first times (new to this part of the game), it seems like this is a step-by-step progression from 'we have users!' to 'users are paying!' If I were working my way forward yours would absolutely be my next question, along with figuring how to target the 20% of customers that drive 80% of my revenue.
Do you think that it would be better to have the revenue model fully thought out (through to revenue/user and lifetime value) before a/b testing the pricing models?