It will be interesting to see if CW would allow this scenario.
Purchase on Mar 1 full up front. On Feb 28 2016 I see some cool feature is "announced" for delivery in March (the Talent Button). I pay for a month on March 1 2016. The feature (Talent Button) is delivered on March 31 2016. I opt-out on April 1 2016.
Do I get to keep the Talent Button forever?
Of course I would think that if I purchased a month on > March 1 1016, I am an opt-back-in and I need to pay 12 consecutive months to get to keep the Talent Button.