Disclosing that the next communication satellite GSAT-10 was ready for launch, Radhakrishnan said it would be put into orbit by a French Ariane satellite in August 2012. It will add 30 transponders to our existing capacity.
This would be followed by GSAT-11 which will provide India with a larger transponder capacity of the order of 10 gigabits to enable DTH service too. In a few years, the Isro will go for even heavier communication satellites.
http://www.deccanherald.com/content/245056/much-awaited-gslv-sept-oct.html