The Mughals did extremely well in the last installment, shooting up the power rankings due to their high population, advanced tech, and good placement. There's still plenty of room for them to expand to the south. However, they still only have two cities, and Afghanistan looks poised to cut off any attempted northward Mughal advance.
Tibet is a very interesting civ, as the geography of their area makes it very hard for an invader to succeed. If they can grow beyond their mountain home, then they could very well be a force to be reckoned with. On the other hand, if they end up locked inside the Himalayas, we can at least be sure that they would be the MOTHER of all turtles (at least until artillery and airplanes start appearing).