http://www.bungie.net/News/content.aspx?ty...s&cid=12912
All day October 31st till 3 AM November 1st, there will be ranked infection playlists available (zombies, rarrrrrrrr, get it!?) You'll also be able to get achievements in this mode, making it a great opportunity to get some of the harder to get ones like sword spree, kill frenzy, etc, since this a team-based rather than solo mode. There are also some special infection-exclusive medals to get too!
Max party size is 4, so lets man up!
