Add an option '-C|--copies' to hg status to show the source of copied files.
Copied files are displayed in the form:
A newname
oldname
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)