Create a new branch, made a lot of changes, how to view list of files changed?

Question

So there was a new branch created where we made some breaking changes to the codebase.

Now we are going to merge, but before that I want to get a list of all the files that were changed in the branch.

How can I get a list of files? I tried:

hg status --change REV

But i'm not sure if that is what I want, since I want all files changed in this branch and not a specific revision in the branch.

BTW, how can I view the revision numbers?