Sky name won't be dropped as the agreement to use the brand name is between Tata and Sky UK Ltd (Sky International AG), and not with 21st century fox.
Sky UK Ltd is an independent company just that owners have changed.
So Tata Sky has taken rights to use the sky name from Sky International AG.
It has nothing to do with 21CF, Comcast or Disney.
There is a connection bhai and i had discussed this in detail few months back. Tata and Star jointly started DTH business. Star/Fox held majority stake in Sky hence was able to use/licence Sky trademark in India. Now that Sky is owned by Comcast hence Sky trademark cannot be used by Disney which is new owner of Star India. After expiry of agreement changes r bound to happen one way or another.
Tell me one thing if Disney decides to continue its venture with Tata in DTH sector then why will it allow name of a company from its competitor Comcast to be used in their business? Sky name will continue only if Comcast buys Disney stake or Tata Sky takes over full control and signs some trademark agreement or working partnership with Comcast