id Software's Marty Stratton has posted on the official Quake Live forums. Mac and Linux support has been highlighted as something that is a top priority and is definitely on the way. PunkBuster, as always, is causing some issues and they've set up a forum to try and help people resolve their woes there. There's a lot of other stuff there, but what caught my eye was this related post that discusses their plan for dedicated server management, indicating that id are going down a nearly completely different route for server hosting, eschewing the typical GSP-supported method:

Our plan is to completely integrate the ability to start and manage private games directly through QUAKE LIVE, utilizing all of the friends, awareness and notification features we have available through the site. This ability will be the cornerstone of a QUAKE LIVE Premium Service that will be offered for a small monthly fee (likely less than $5 per month). So, for 1/3 to 1/6 the price that it normally costs to run a private match, we'll be offering players the ability to easily start a private match with these benefits:
- On demand - whenever you want to play privately, you simply set it up, play, and when you're done, those slots go back into our "public pool." This is how we can offer it for a substantially lower cost than is typical.
- Each match you set up can be in a different location. For example, if you're in NY and you want to play a friend in CA, chose a neutral location in Illinois or Texas. If the next time you play, you want to invite a friend also on the east coast, then run the match in Virginia.
- The interface is completely integrated into QUAKE LIVE and uses all of the back-end friends and friend awareness systems that we have at our disposal. So, when setting up a match, you'll be able to select the friends you want to invite and have a pop-up automatically alert them to your invitation - allowing them to join with one click.
- Private matches will also have access to more competitive game features that can not be practically used for public matches - like locked teams, timeouts, etc. (more on this below).

I've heard good things so far about the server availability in the beta, so it'll be interesting to see how the full game fares.