who commited a revision:

svnlook author -r <revision-number> <repo-name>


Show changes:

svnlook changed -r <revision-number> <repo-name>


Get the log message:

svnlook log -r <revision-number> <repo-name>


Show which directories have changed. Can be used to find if trunk or branches.

svnlook dirs-changed -r <revision-number> <repo-name>