One more new feature:
There is now an option that allows you to pick which key(s) are returned when a client program requests a list of all SSH keys in the agent. This is useful when you have a large number of keys or you have multiple keys for one server/username (like firstname.lastname@example.org). Note that this works in Agent mode only.
Also, since I didn’t put out an announcement for v0.7.3, you might like to know that Ed25519 keys in Client mode were fixed in that version.