Delivery date may slip but I don't think it will be by much if it does.
I'd be incredibly surprised if they go above the $35,000 base price, they've been talking about it for quite a while now and I'm sure they know if they can meet it or not.
The first people to configure will almost certainly not get the chance to test drive one before they have to confirm.
They will, eventually, run out of tax credits. Depending on how fast they actually ramp up they may well hit 200,000 before the end of 2017.