Wouldn't we all love that. Alternatively, you can make one on your own. Or just use WinMerge to see the changes visually.

1. You can use Trac to generate a list of diffs: http://trac.elgg.org/changeset?new=6876%40elgg%2Fbranches%2F1.7&old=5833%40elgg%2Fbranches%2F1.7
2. You can use diff tools to generate this as suggested by Yakiv
3. You could use svn to do this