Detect renamed files and handle by renaming instead of delete/re-send.
rsync 3.0.0 was supposed to have renamed file detection, but it was silently dropped.
I'm currently working on rsync 3.0.0, which is going to be a feature release that has a number of improvements. There has already been work done to lower rsync's memory use, and make recursive transfers start up more rapidly (due to an incremental recursive scan being added). This version has just added ACL support, and should also get: xattr support, filename charset-conversion support, renamed-file detection, improved performance for large files, and other changes yet to be decided.
But some time afterwards they removed any mention of it. There is also no mention of renaming in any changelog or news item. They simply purged this announcement entirely.
2294 - Detect renamed files and handle by renaming instead of delete/re-send
Apparently this isn't actually possible.
--fuzzy doesn't do it.