This was posted by daviesh at atlasmod.com:
http://www.wowace.com/forums/index.php? ... #msg230826
Main bullet points:
-In a surprise to no one, wowace has been bleeding money in terms of bandwidth so curse have been propping them up
-The repository will be re-arranged and addon authors able to restrict access to their mods
-files.wowace.com and the WoWAceUpdater will be killed off. Both are HUGE bandwidth hogs. Curse/Curseforge will now be the front end for the repository and the WoWAceUpdater will be replaced a new Curse Client.
-The changes will happen mid-August