IMHO, Homebrew offers a lot of advantages over traditional package management tools. It's simple to use, offers a really easy way to add your own packages, and contributing upstream is quite painless. MacPorts has always been reminiscent (to me, anyways) of the FreeBSD Ports Collection...it might even be based on it I'm not sure. So this seems like a prelude to a possible sunsetting of the MacPorts project in favor of simply using FreeBSD's package management tools on OS X. Not sure it's going to draw me away from using Homebrew just yet, but it's nice to know that there's a continuing effort to have OS X be a part of the UNIX-like OS community.
(fake edit: it's been a LONG time since I've used FreeBSD. feel free to chime in about how wrong I am regarding the ease of adding ports on your own private or public server if things have changed)