Well, your not too off. Like ASICs are made for mining cryptocurrency. Specialized processing designed for specific computations. This indeed make it's efficiency greater than a general purpose CPU.

They already have dedicated hardware they call the neural engine, and use for coreML, ARKit, some of the magic they do to turn terrible sensors and lenses into passable images, etc. There's a lot of processing that already happens on your device. Being able to search your images by subject might be something Google does too, but Apple does it locally.

So my guess is they'll just adjust the architecture of the neural engine to accommodate any new requirements, rather than adding a "new core". But it's kind of all semantics. There will be new hardware components and intercommunication at a low level.

Yes!

Apple added (a while back) what they call a “Neural Engine,” which is hardware dedicated to efficient execution of ML workloads.

https://en.m.wikipedia.org/wiki/Apple_A11

They have been refining it ever since. I would not be surprised if they made advancements in both the hardware and software used for local GAI.

not a dedicated chip per se, the trend is to build it directly into the SoC (mobile devices) or the dedicated GPU