The WoWAceUpdater is being discontinued while wowace.com is making the transition into becoming curseforge.com.

http://www.wowace.com/forums/index.php?topic=14316.0

What this means for us: For all of us who stand by out Ace-based addons, we'll be using the new curse client to update addons starting in August. Read that forum thread carefully and take it all in. Basically, instead of updating to beta versions of addons every night, we'll be update the "realease only" versions of addons on a less frequent scale. Of course, we'll be able to select "download betas" (I certainly will) to get the latest and greatest versions of our addons.

The ONLY thing we'll need to really worry about now is making sure that our favorite mods all make the move to the project space at www.curseforge.com. Let's hope that there's still active development on all the addons we've come to love and they make the switch!