My wild and crazy prediction:
They are going to make the classic set free. Much like the basic set. I'm also guessing that getting the free classic set will involve completing some new (free) PVE content.
They've been nerfing the crap out of the classic set for a while now. It might be lousy enough to be given away free now.
And since classic packs will be a thing of the past we will now get rewarded with current year packs for Tavern Brawls and Arena runs and such,
That sounds awfully generous...are you sure your talking about Blizzard?