Someone may have cancelled their order, or given up their allotment.

Either way, it's up to you when to take delivery. If you don't want the car now, tell them you want to wait. It's up to you.

They can't keep your deposit, at least in any State I'm aware of.

There's nothing suspicious about it, and asking for a price cut for accepting the car early seems like a tactic that won't be very successful.

Then again, it's worth a try...