To answer in order,
I believe it's the same as the Pro X, [guide|127703|which actually got a 6/10|new_window=true]. However, the battery is firmly glued in just like it.
Microsoft has said in an interview that they will make repairability a focus with the Pro 9. [link|https://www.youtube.com/watch?v=bGP1pO8nGDc|The iFixit guide proves this.|new_window=true]
Unfortunately, with the collab, it's only for pro users. Maybe in the future!