By seeing the history of past additions in Airtel, They are mainly concentrating for exclusive channels, I think they are having some big plan. Most of the channels they added are exclusive though they are FTA's and carriage fee channels.
And If we see by past Airtel will hardly adds a channel during the period of June - August, but at the end of every year (October - December) they will add all popular channels in bunch and overtakes its competitors. So lets wait for some more time for :hd channels