Diablo 3's upcoming expansion, Reaper of Souls. In the past, Blizzard has only invited friends and family members of its employees to play during these beta phases, but this time the developer is inviting "valued media contacts" and 3,000 of Diablo 3's most active players, who have opted-in for beta testing through Battle.net, across the world.
The beta isn't restricted by an NDA, so participants are free to post videos and articles about their experiences. This beta will include the full Reaper of Souls expansion, minus the final boss fight – so be mindful of spoilers when hunting down coverage.
Blizzard says the beta has only been sent out to a select few so far, but it'll move into full-on closed beta testing before year's end. If you want in, make sure you're signed up for beta testing on your Battle.net profile.