We had to shorten our trip by 1 nite so I have some points in holding right now. Would I be able to use these points to stay at a Concierge Collection hotel or do I have to use them at a DVC resort with the less than 2 months out booking window?
They may be used for Concierge Collection resorts as long as you are not within 4 months of the end of your Use Year. During the last 4 months DVC points may only be used to make reservations at DVC resorts. (If you are still beyond 4 months, you can make reservations to stay at Disney Collection and Concierge Collection resorts though.)