In the The Current State of Voice - July 2024 thread Mike recently confirmed that Nabu Casa are actively developing a voice assistant device, which will be based on the ESP-S3 with an XMOS audio chip. More relevant, he expects the Voice Kit to become the go-to device … but RasPi’s still have a place in the technology matrix.
I agree that RasPi is overkill for a simple satellite device, and (at least here in Australia) far too expensive for dedicating to that single task.
Curiously a couple of other threads here and here have recently been mentioning up-coming devices with similar hardware, and apparently there is a lot of activity on github around these chips.
As for the Raspberry Pi & Wyoming-satellite …
I have 3 RasPi based Rhasspy voice satellites which I am not yet confident to upgrade to wyoming-satelite - and yes, the development effort definitely has shifted away. Mike stated that he anticipates being busy on VoiceKit for the rest of this year.
However when the VoiceKit is established in the market I am sure Mike will have plenty of updates to apply to wyoming-satellite 
But the waiting is hard 