Did arena reward pack types change with the release of The Grand Tournament?
Following The Grand Tournament's release, does the arena now reward Grand Tournament packs in lieu of the previously rewarded Goblins & Gnomes packs?
Solution 1:
Arena now rewards a random card pack.
Directly from Blizzard:
Arena Rewards
Players will now have a chance to receive any of the current Hearthstone card packs (which include the Classic Hearthstone set, Goblins vs Gnomes, and The Grand Tournament) whenever a card pack is awarded, with a greater chance to receive The Grand Tournament card packs.