This is the list of ships which are for sure to be inducted into the navy till 2015 (source: wikipedia)
1.) Kamorta Class Corvettes (4) - INS Kamorta, INS Kadmatt, INS Kiltan, INS Kavaratti.
2.) Shivalik Class Frigate (1) - INS Sahyadri.
3.) Kolkata Class Destroyers (3) - INS Kolkata, INS Kochi, INS Chennai.
4.) At least 1 scorpene submarine.
5.) SSBN (2) - INS Arihant, INS Arindham
6.) Aircraft carrier (2) - INS Vikramaditya, INS Vikrant.
7.) Talwar Class Frigate (2) - INS Tarkash, INS Trikand.
These add up to 15 ships, please expand the list if possible also how much Indian Navy ships will retire in the given period?