Bornakk has stated in a post on the official forums that the dev team is changing how items and titles are obtained in the 2 vs. 2 bracket in Arena Season 7 due to player feedback. While Blizzard feels 3v3 and 5v5 are the best options for competitive players, they're still going to give players access to the current season of gear in 2v2 in patch 3.2 with three exceptions:

• The current season's weapons won't be available for purchase
• The current season's shoulder armor won't be available for purchase
• You won't qualify for the Gladiator title or rewards unless you earn the rating in 3v3 or 5v5

You can discuss these changes in this thread in our general forum.