Blizzard has announced the commencement of the open beta for its new unified desktop launcher/installer. For now, players have the option to use the launcher in open beta. All game client launchers will eventually be upgraded to the unified launcher for Starcraft, Diablo and world of Warcraft.
What's this launcher update do? The new single sign-on functionality allows players to log in once to access World of Warcraft, StarCraft II, Diablo III, and the upcoming PC and Mac versions of Hearthstone: Heroes of Warcraft, and stay logged in for up to 30 days.
Players can also install games directly through the app and, if you choose to leave the app running on your desktop, keep them up-to-date automatically even while you’re away from your computer. Please note that it’s entirely up to you whether you wish to leave the app running—you can exit it at any time, and it will automatically re-launch whenever your standard launchers would.
Read more, including a handy FAQ, on Battle.Net.