It's still the same booster pack, just with much more content for your enjoyment, and to answer your other question you can purchase them, and log in game between now and when MEGA event is over to claim them if you want the Golden Egg, Rares Case, and Mega Rare Gift bonus to the booster packs.

It's still the same booster pack, just with much more content for your enjoyment, and to answer your other question you can purchase them, and log in game between now and when MEGA event is over to claim them if you want the Golden Egg, Rares Case, and Mega Rare Gift bonus to the booster packs.