We know that the world powers will keep growing.
China Russia Usa
Potential? Venezuela! It is so depressed that, although it may be worse, it has more rank and opportunity than most countries to grow. But it is not only because of how bad it is, it is because of the resources that still count and because of the capacity of many of its people of productive age. For now, it is still down, but the day it starts to improve will be definitely spectacular.
Brazil is good, as is India. Another country with high growth potential is Israel that prepared for a World 4.0. However, my answer focuses on the Asian tigers, and focuses on the two laggards: Vietnam and the great Korea, although it depends on the progress of the process initiated by its leaders.