Samsung Galaxy SIII will be available in India by first week of June for INR 38,000 approximately. At present you can buy Samsung Galaxy SII for INR 28,000 in India. Galaxy SIII is unveiled to the world yesterday in London on Samsung Mobile Unpacked 2012 event. you can watch the event video here.
Even with the power of quad-core processor and 1GB of RAM, Galaxy SIII previewed as laggy.