A DragonFly machine with a lot of network traffic will have a significant amount of memory consumed by all the running network connections.  (as with any system)  It's now possible to adjust the amount of memory set aside for those operations, live.  This sort of fine-tuning will only matter if you run an extremely busy machine, but it's worth it if you do.
hostapd, for creating a wireless access point, has been included in DragonFly along with wpa_supplicant, for a long time.  Like wpa_supplicant, there's a version in dports that is the latest version and is easier to update (e.g. no system update required to get a newer version.)  Unlike wpa_supplicant, there's no chicken-and-egg installation problem if it's not in the base system - so out it goes.
If you've previously tried to install DragonFly using a USB thumb drive, and it would somehow not be found to boot from, there's a potential fix.
DragonFly ships with wpa_supplicant, for setting up WiFi.  However, there's no guarantee it's the latest version.  A solution exists: security/wpa_supplicant in dports.  However, this has a chicken-and-egg problem, where you need wpa_supplicant to get online and download the dports version of wpa_supplicant.  So, DragonFly still includes wpa_supplicant in the base system, but you should upgrade to the dports version when possible.
DragonFly now has the same math library (libm) as OpenBSD, replacing an earlier combined version of I think what NetBSD and FreeBSD ran.  This doesn't necessarily directly affect you, but it's work worth doing; matching the underlying frameworks between BSDs helps everyone.
A lot of variety this week.
The 99th episode of BSDNow is about Gnome on FreeBSD, with interviews of Baptiste Daroussin and Ryan Lortie, plus more news that I was already planning to link to.
Sepherosa Ziehau has been doing a lot of work with various processors states to save power on DragonFly.  He's published a summary of how well the various P-state/C-state/mwait settings work.  He found that setting a lower C-state can perversely improve performance. For those saying "but how do I set these lower power states?":
sysctl machdep.mwait.CX.idle: AUTODEEP
sysctl machdep.cpu_idle_hlt: 1 (or higher)
No theme, though I've been thinking about IPv6 lately.  Mostly in a "oh man all that PLC equipment at work can barely do IPv4 this won't be easy" sort of way. Your unrelated comics link of the week: The Dr. Fun comic archives.
I seem to have In Other BSDs exactly 1 day off from the OPNsense release schedule, so far.  
Michael W. Lucas is having an "open dinner" tomorrow, in Scottsdale, AZ.  That means you get to talk about his tech books and BSD and conventions and whatever else enters collectively enters everyone's heads, I assume, over dinner.  (you buy your own food; the talking's free)  It sounds like a potential little mini-convention; you should go.
BSDNow 098 is up with the normal collection of news and links, plus an interview with David Meyer of Xinous - which I infer is using FreeBSD to underpin their main project.  I always find the decision/planning around major commercial open source interesting, cause the open source aspect changes the game, so to speak.
I don't have actual numbers, but I do have a note: DragonFly network performance is pretty darn good.