Yes, we have a feature called 'History' which you can access from the editor. It lets you see the changes that have been made to your project over time. It's a bit of minimum-viable-feature at the moment, but it's still quite useful, and we're always open to feedback on how to improve it for your needs.
Yes, we'd love to do that. I coded up a prototype a while ago and found that latexdiff can quite easily get confused and produce LaTeX code that won't compile. I definitely plan to revisit this though and try to get something working.
