Yes, it's Blizzcon!
I'll confess that I haven't been quite as invested in this one this year as I have been in the past, given that most of Blizzard's games have been updated rather recently. Legion launched about two months ago, Legacy of the Void isn't that old. Hearthstone and Heroes of the Storm get regular small updates.
With the opening ceremonies happening now, any huge announcements are imminent, so I'll post anything really big that's coming.