KerryCM - enjoy your day, how exciting that you will be at the Grand tomorrow! Looking forward to your live reports.
TomorrowlandFamily - Welcome!

What a wonderful first trip you have planned!
The construction we have all been discussing is not at the Grand itself, but on the beach next to it, where the Spa and Wedding Pavilion are located. There are walls up around the foot path between the GF and Polynesian resorts, which winds past the beach, but no walls in the GF lobby or on the grounds. Lagoon view rooms that look toward the Poly will have a view of this construction, but most of the rooms will not.
So far, guests have reported there has been little to no disruption of their vacations, other than the unsightly dirt work you can see from the monorail. How long this will continue before the more noisy work begins is anybody's guess. Hard to tell how it will affect the resort month-to-month, but if you keep reading here and elsewhere on the DIS, I think you will get a clear picture of what is going on at the resort. We have quite a number of posters with trips planned in the upcoming months.
BTW - if the rumored monorail shutdown occurs before your trip, that will definitely have a negative impact on your stay. Unfortunately, there is no way to know if that will happen until Disney announces details.
Jungle Cruiser - I know what you are saying, and I agree Disney will likely come up with transportation options. I do have to agree with those who are saying the rates should drop for monorail resorts, though, as that is a big, big reason for the higher rates (over other deluxe resorts).
BC1836 - I'm sure Disney could figure some way of making that path work, but doubt they will go to the trouble and expense of doing it!
