You sound just like me. I started planning in March 2014 for a Disney trip for the first full week of June 2015. For my group, we were looking for two 4-bedroom units, or a 4 and a 3. I noticed several sellers on eBay selling 7-nights in 4-bedroom presidential "last minute," from 8 weeks out to as close as one week out, in late March-May 2014 for the first week of June 2014. So I hoped and assumed that would be the case for 2015.
We had one specific date that would work for our group, four different families coming together. The short of it is that just this past week the June 2015 dates came online. There was only one 4-bedroom presidential available, and the seller also had a 3-bedroom presidential, so we reserved those two units.
My point is that you may not have any luck making a reservation this far in advance. I contacted two eBay sellers at the 10-month window in August 2014, thinking they could at least make that type of reservation. Neither could do it for me. I also contact Vacation Strategies at the same time, but they wanted maybe $350 or $400/night, so I took a pass since the same unit was going for a low as $200/night on eBay at two months out.
We waited to make our reservations this late (10 weeks away) and got what we wanted. We paid $240/night for the four-bedroom. They can get as low at $200/night for a four-bedroom the closer one gets to the date, but obviously this is an important trip, so we just made the reservation as soon as it came up on eBay and didn't try to haggle the price (there was a "make an offer" icon, but we didn't want to risk loosing the 4-bedroom since it was the only one, and let's face it, $240 a night is a pretty sweet deal for prime season for a 4-bedroom presidential.)
So, if you can stomach to wait that late, I would suggest watching eBay this season for the approximate week you want in 2016, and then start looking in March 2016 for those June 2016 dates.