Last November, Blizzard announced that they were working on testing updates to Battle.net's communication and login functionalities. That testing is ongoing and has now been moved to an open beta. Blizzard is looking for interested players to help them test a new desktop application designed to improve the launcher and login experiences for all Battle.net users.
If you're interested in being a part of this beta test, you can head on over to your account page and opt-in to a Blizzard game universe beta test. As is usual, invites will go out in waves, so you might not get yours right away. Happy testing!