If you have BWV and OKW points, a February use year, and will want to use Feb 2017 points and borrow Feb 2018 points for the June 2017 trip, then:
In July 2016: you can reserve BWV GV with BWV points or the OKW GV with OKW points and use for the reservation your Feb 2017 points plus borrow any points from Feb 2018. Whether you can borrow depends on time you will be at WDW not time you call to reserve. The date you call to reserve is irrelevant to point use.
In Nov 2016: you can call (or go online) to reserve a GV at any resort for June 2017 and use both the BWV and OKW points from Feb 2017 and borrow from Feb 2018.
If you call to reserve a BWV GV at 11 months out, or an OKW GV at 11 months out, you most certainly will get it. At 7 months out and based on historical reservation patterns for June: (a) BWV GVs will likely be difficult to get although you might get lucky; (b) OKW GVs will be easier but may also have some issues with a few days missing here and there; (c) AKV Kidani GVs will likely be open except for standard view; AKV Jambo GVs are likley to be difficult to get; (d) VGF, BLT, and SSR GV's will likely be open.
If your intent is to try for either BWV or OKW, then book whatever you can for both at 11 months out, as long as it is different days for each, and then at 7 months try to switch one to the other.