From their announcement:
The Admiral Rules Pack is now available for Pre-Order. I expect the product to be shipping within the next week and for the near future, I will be offering FREE SHIPPING on the Admiral Rules Pack. For only $10, this expansion is a great addition to Legends of Kalidasia.
The Admiral Rules Pack requires Legends of Kalidasia: Rise of the Surakari for game play and expands on the base set with new warships, new weapons, a new scenario, and enhanced destruction rules. Experience the true violent nature of the Kalidasia Universe with this expansion.