This seems to me like just another gimmick to lure prepaid customers into using postpaid. Nothing else much. May be, it could be useful for existing postpaid customers, who also have existing Airtel DTH and/or Airtel Broadband connections.
Looks like they have just renamed the 'One Airtel Plan' as 'Airtel Black'.
With the Airtel logo being in red color and all, they really should have gone for 'Airtel Red'. I don't know, may be they'll do it for the next iteration of the gimmick?
Link to 'One Airtel' plan (now everything in the page says 'Airtel Black'):
Hey guys, how is this Airtel Black.
If anyone has used this, how is the service? Do they have priority CC as they say and are they really better than the standard Airtel CC?