UAC DayZ Mod Beta has been updated to release 1.2. This is for people who want to run their own servers locally, on a LAN, or on the internet.
If it is your first time installing, grab the full 1.2 release. If you already have it installed, just grab the Release 1 Patch 2 archive, which also includes Patch 1.
This release/patch makes the 'End Game' mission more challenging to complete and more exciting, as well as removing some extraneous intro text. Patch 1 is included, and that fixes a critical bug.
UAC DayZ is more about PvE, and supports single player as well as multiplayer. It is built on Dayz Mod 1.7.6.1 and adds a lot more, focused on old-school survival sandbox though, combined with missions to have an optional 'End Game'. Please see Uacdayz.scoredoom.com for more information, and the promo video below: