I wouldn't hold my breath.
I agree.
The Heatpump is mostly associated to the current Model Y battery implementation.
If the Model S/X or the Model 3 in the future receive a new battery then the effort for putting an Headpump would be justified.
Otherwise the process of re-validating an upgraded cooling system on an existing Model don't seem worthwhile.
Honestly, the Headpump is certainly great especially in cold climate, but let say overall it could be only a 10% (?) improvement.
What people are the more concern is the initial price of the car, and a 10% or so range improvement would not move too much sales.
I just try to imagine the current complexity of managing new software release considering the number of version of each models,
and the number of changes already made year after years, and also the location of the car (Right Hand Drive, European Regulations...).
So adding a new Headpump would almost double the number of software versions to manage when making a new release build,