You can get burned by a "six month" rule! Check, check, check.
Basically you're (often) exempt from tax in your new state if you were registered in your old state at least six months. I would wait for the move if at all possible. Or, if you can sign a lease ahead of time or otherwise prove (future) domicility to KY, make a trip up there ahead of time to get plates. You would need an address to give the dealer for title purposes, and if you're financing and need pay stubs this can be a mess.
A domicile is where you INTEND to live permanently, so if KY will be your thing, there's your excuse.