Not really. 1.5? T3 terrain engine. 2.0? T4 terrain engine which allows for new maps. Black Sea map doesn't function properly on T4 yet, so to get Nevada out before the end of the month, they will release 2.0 as a separate Alpha install with just that map. Later on, when the Black Sea map has been updated to function properly, it will join NTTR in the 2.0 install.