Toured the property today, and it is gorgeous. To answer some of the questions listed earlier...
The hotel's bus is dedicated to the Grand and does not stop at the timeshare portion.
All of the F&B outlets are open, with the exception of Back Bay, which will be the casual eatery by the pool and on the lake. It is due to open in a couple weeks.
And yes, it was confirmed that guests of both the Grand and timeshares can use the other's facilities.
The rooms are awesome, the concierge lounge is gorgeous, and as best I can tell, this place is an incredible value.