The Samsung Galaxy S 4 is slated to be released in India on the first week of May following a week-ahead release in the UK. Other markets will also get the Galaxy S 4 around the time that India will. Furthermore, it will get the Exynos 5 Octa version, which will only have 3G connectivity on its first release on May and the LTE-enable version will said to be available in the country on the second half of the year.
There is no information about the exact date of release but information about the pricing showed that the S 4 is said to cost around Rs. 40-45k and could be even more affordable when purchased with a plan or a contract. Two of the carriers who will surely sell the new handset are Vodafone and Airtel. Keep checking these carriers' websites for details about pre-order and pre-registration.