After preview it will be a paid subscription additional to Office365, the same strategy as Office Copilot. I hate this policy of pay for a product then still paid for more functionalities... at the end of the year you will have paid a lot.
Microsoft says Python in Excel will be included in a Microsoft 365 subscription during the preview, but “some functionality will be restricted without a paid license” after the preview ends.
I find it very interesting and I want to do one with my kids. The guide is good from a step by step point of view about how to make one, but I think a couple of examples about what kind of data can someone get with it and what can someone expect to "view" could be very helpfull too