There will be two new Checkers, a Sport-Pickup Crossover (being a Ford guy I'll say it's like a Ranchero), and a 12-passenger sedan.
Selling 500 units per year should not be a problem; there are many Checker aficionados out there. No cost has been give for the new Checkers but seeing as they are essentially hand-built in the U.S.A. I would expect them to be pricier than a used one.
Checker Motor Cars provided a list of features besides the engines. A few are composite body panels, rack and pinion steering, 4-wheel disc brakes, heavy duty climate control, all-wheel-drive option, and many others.
Checker Motor Cars will retrofit your old Checker with any of these features.
If you're interested you can check them out at http://www.checkermotorcars.com/