This is just my guess, but I think the new "Fastpass" system will not have advanced booking windows of time at all. I think it will be set up as a pay per click type system, with some free ones for resort guests. So you will basically have a standby wait time and an estimated "Fastpass" or "Lightning Pass" or "whatever pass" wait time and you will choose if you want to use your pass then or not.
So Space Mountain, for example, may have a 60 minute standby wait and a 15 minute lightning pass wait. You choose right then if you want to go standby or burn a free pass or pay the fee.
No more logging in your computer 60 days out to come up with your touring plan.
I am curious what the traditional fastpass utilization rate was for onsite guests. As crazy as it sounds to those of us on the Disboards, I bet there were a lot more people than you would imagine, even staying onsite, that didn't use their fastpasses. Probably because of last minute trips, last minute planning, etc.
Under my proposed system, lightning pass utilization would be higher because it doesn't require advance planning. Therefore, my guess is that onsite guests will get 2 free ones/day. Offsite guests will get zero.
Think about the perceived value for a minute. Assume the lightning passes average $10/person/use. For a family of 4, that's $80 of "free" lightning passes/day for staying onsite. With the additional 30 minute early entry, that is real value to staying onsite. All of a sudden, a moderate resort compares pretty well in value to my Holiday Inn Express room. In reality, they will be able to further increase Disney resort prices.