You are wrong about your date and use year. Since you have a June use year, your next trip in April 2016 actually is within your June 2015 UY. Your 2016UY starts June 1st, 2016. So April 2016 is still your 2015 UY.
If you need 240 or less points for your trip, then you can rent out your remaining 2014 points. If you need more than 240 I would bank the amount needed of the 2014 into your 2015 so you can use them along your 2015 allotment, then sell the remaining if any. That way you will not need to borrow the next year (I think is always best to bank instead of borrowing) and you can plan a new trip after June 2016 without borrowing.
Other alternative is to bank all your 2014 points, use those first and whatever amount of 2015 you need, and the rest 2015 either bank them into 2016 or sell them.
Thanks, I do get confused regarding how long banked points are good for and when they expire and how far forward I can borrow points.
Our next trip will be April 2016 but the following one won't be until April or June/July of 2018 as we have family trip to the Grand Canyon in summer 2017. So that was why I was thinking of selling the 2014 points and some of the 2015 points, holding some 2015 points and borrowing points for our April 2016 trip.
Thanks!