There is just a single, yet important new feature:
major new feature: imrelp/omrelp support reliable delivery of syslog
messages via the RELP protocol and librelp (http://www.librelp.com).
Plain tcp syslog, so far the best reliability solution, can lose
messages when something goes wrong or a peer goes down. With RELP,
this can no longer happen. See imrelp.html for more details.
And, no, this feature is not related to April, 1st. Really. Trust me ;)