Update:
Players have been looking forward to testing Ashava, the World Boss in Diablo IV Beta. However, we’ve run into a snag – Ashava can’t manage to get into the login queue either.
Blizzard is aware, as per a tweet by Adam Fletcher. Ashava should have spawned at 10 a.m., 12 p.m., 10 p.m. and midnight PDT, but clearly the 10 a.m. timeslot has come and gone, and many players are wondering where their loot pinata is.