I just skimmed through the podcast so I might be wrong, but it looks like the subscription would only cover updates to their AI “features”:

‘[…] is there a vision beyond “the software will do more for you” than just drive your mouse around?’

[…] Should the mouse do more than just move the cursor? Absolutely. And it does that today, and I think similarly about being more productive with shortcuts to the large language models and all kinds of other things. The guy that I met at a barbecue over the weekend who has programmed 120 shortcuts on his mouse, that’s the kind of stuff that can extend human potential in ways that are healthier.