According to website MMO-Champion the Blizzcon 2015 Schedule was briefly shown but not officially released showing us some of the plans that would be going on. Sadly there is only one panel for Diablo 3 this year (that we know of).
Friday – 3:30 PM PST to 4:30 PM PST (Panel Stage, Hall A)
Join the Diablo development team to learn about new zones, new sets and legendary powers, new monsters, new features and more.
They also have images of the schedule so check for them after the break for the full view.