We have not yet fully fleshed out all of the planned features for CANVAS -- we are always listening and re-prioritizing our development plans based on customer feedback. Our most recent update on pricing can be found here in this blog post.
We intend for many features in CANVAS to be free (especially to Palette owners). We also plan for CANVAS to support other multi-material things (like the Prusa MMU). There may be features that we charge non-Palette owners that are free for Palette owners. We also have ideas for some industrial features planned in the future that would be paid only (e.g. run a farm of 100 printers / Palette 2s and dynamically assign prints to different Palette 2s). In general, Palette & Palette+ owners who have watched Chroma evolve over the past year would support the claim that we listen to customer feedback and are always aiming to improve things.