Ben Brode confirms that the arena will only reward the new packs once the expansion is live.
That seems very odd and not very new player friendly. They should have given out a chit that then allows a player to choose the pack type they want (GvG or Expert). I think this decision is going to bite them in the ass with players who don't have the entire Expert collection yet.
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Going 7-2 with this one! Smooth as hell, still have to master how to use it properly. Thanks!