HearthStone

Cards
The basic card nerf announcement will be made close to the Old Gods release.
Ironbeak Owl and Big Game Hunter don't fit well into the Classic set.
The Curse of Rafaam + Nozdormu combo is a bug.
More Old Gods Deathrattle cards should be expected. He stated that he wouldn't talk about unreleased stuff in the expansion when asked about good Deathrattle cards.
Unreleased Cards
Grounding Totems were going to be a thing but were taken out before beta. In Warcraft, a Grounding Totem eats an enemy spell cast.
TGT was supposed to have a Pirate Legendary minion. It was too powerful at the time but could fit in for Standard.
Heroes
More alternative heroes will come, but not in the near future.
Tavern Brawls
Pat Nagle and Dan do most of the work on Tavern Brawls.
Jomaro Kindred does chalkboard art.
Brawls are created through brainstorming, looking at ideas from the community, and ideas from the team.
Features
They are looking into an option to randomize your card back when playing, but it isn't something we'll see in the next update.
Ben Brode
Owns an HTC Vive and streams Hearthstone from the same room he uses it in.
His favourite Hearthstone deck is Control Paladin.
His favourite pizza restaurant got nerfed (shut down).
He believes the Old Gods card pack opening animation is awesome.