Air Nauru gets new 737. But what type?

Hi guysLast december, the only aircraft in the fleet of 'Air Nauru', boeing 737-400 registered VH-RON was seized by the american bank because they have not paid for over 4 years, or so i am told.The taiwanese government has assisted the airline purchase a new 737. Does anyone know what series this is going to be. I am assuming most likely a 737-700 or -800?Thanks