From a FP stand point there shouldn't be enough demand for FP+ to make a difference in availability at that time. If you are staying off site, you will use the FP- and everything should be like normal. If you are staying on site, you might be convinced to use FP+ but it should be fine because you will have plenty of choices to grab FP even at check in.
Now if you are worried about spending too much money, beware of the magicbands.
When everything gets up and running, it seems that is the plan.
In the terms and conditions and the interview with nick Franklin (both can found on the first page), it appears that you should be able to link your ticket to your online account. Resort doesn't matter. You will get plenty of information, about which is more effective FP- or FP+ when the trip reports start coming in. Stay tuned.