I have no information here.
I only have logic.
It is logical the > 18 months old Powerhouse be either upgraded, or cancelled. It contained a number of basic flaws, which could be resolved.
Anker public statements have been they were positively surprised by the Powerhouse success. It is in many ways better than peers like GoalZero. That would hint at a successor.
However, the lack of Anker hints on a new Powerhouse implies it is cancelled. Contrast with hints in other products.
My current guess, I’d say 60% probability, from the lack of hints, is it is indeed cancelled.