Crusader Kings 2′s latest expansion, Rajas of India, is available now.
Rajas of India extends the map eastward, doubling the available territory with hundreds of new provinces and ports and opening play to the same scope as the original Crusader Kings. It adds three new religions as well as various other bits of content.
The expansion was accompanied by a major update; full patch notes are available on the Paradox forums.
Rajas of India goes for $15.