We have a new arrival due for release April 1st, don't worry this isn't an April fools joke! It's a Garchomp EX box loaded with 4 booster packs, 1 Jumbo Garchomp EX and 1 Garchomp EX pormo!
From the picture we can see 3 XY boosters and 1 Plasma Storm so it looks like it will be a random BW booster packs.