Crusader Kings 2: Rajas of India is the sixth expansion to the series, and it's slated for release this spring.
Here's the official description:
"Crusader Kings 2: Rajas of India introduces a wealth of new cultural and religious events that would appease even the ferocious goddess Kali, including meeting yogis and sadhus, celebrating Diwali and thinking about your reincarnation. Be careful, the Wheel of Life keeps on turning and those karmic forces can be equally cruel.
"With all eyes on Hindustan, the map has been extended far to the east to encompass hundreds of new provinces in Central Asia as well as opening up the ports of The Red Sea and Indian Ocean for navigation by your fleets.
"Raise war elephant units and fight in the dense jungle terrain. Make Siddhartha proud as a Buddhist and advance your technology or maintain a harmonious stable realm as a Jain. Raid your neighbors as a warlike Hindu of the Kshatriya caste."
The expansion will contain the pluralistic religions Hinduism, Buddhism and Jainism, and you can get a look at the new map through the teaser video posted below.
Rajas of India launches in March.