You have to understand the processes before an addition.
In May itself Airtel CEO said they are going to increase the number of HD channels.
If it's a bulk addition and it's going to be on a New TP then New TP activation will take some more time.
Last Saturday one old TP shown up while scanning Airtel TPs so within few days there should be some indication about new channels addition on that TP.
If Airtel decides to add channels one by one on existing TPs Itself it will take more time to come up with what are the Channels they need to add and how many at a time.
Still both the possibility of New TP or addition on existing TPs Itself still there so nobody could clearly say when & which channels going to be added.
Since SD Channels addition stopped and no SD Channels addition happened after first week of this month next will be HD channels addition thats for sure,it could be within this week/month or even more delayed but addition is sure within some acceptable time frame not going to be delayed to next Deepavali or New year.