How long for the Poly to be solidly booked for summer '15?

[dizfan]

At what point do you think they'll start offering an April UY with the last year's points? Should I be targeting early 2016?

If you don't need the points until 2016 and there are no price increases, March 31, 2016 would be the best time to buy an April UY. They would give you April 2015 points, which you would need to bank immediately. The next day (April 1) you would get 2016 points. I believe you would only have to pay prorated dues based on the remaining days in 2016.

Just in case there are hassles or delays, it may be wise to start the process earlier in March 2016 to guarantee no slip ups happen where you would lose the 2015 points.