There's a new addon updater being worked on by wow interface. Supposed to be site indepedent, so it should work with curse, wowmatrix, or wow interface or any other sites.
more info can be found at: http://www.wowhead.com/?blog=94338 (http://www.wowhead.com/?blog=94338)
Should be going open beta on 5/17.
Maybe even a Twilight only one ;)