* devfs(4) has been changed to track related devices explicitly by cdev pointer instead of by (sub)name. The devfs subname* API has been completely replaced by the related* API.
* Fixed some potential deadlocks in dsched(4) and dsched_fq.
* bfq(4), an experimental, work-in-progress budget fair queuing dsched(4) policy has been added.
+* mps(4) driver has been updated and now supports RAID.
* Substantial update to the kernel's ELF handling
* The refcount API has been overhauled.
* A netgraph MP race has been fixed.