December 2016
I think we should get a double weekend xp or double money weekend instead of the community challenge considering the chests don't really give anything good out
December 2016
I don't see this being much of a possibility because the game already contains a system which allows you to double the base XP that you receive by completing the Quests on the Quest board and by making sure to play regularly; by doing so you can boost your own XP modifier easily up to x2.
As far as a coin multiplier, you can already earn large amounts of coins through a good game of Turf Takeover or Garden/Graveyard Ops. Decent play can earn you an average of 25,000 coins on Ops and a good prolonged game of Turf Takeover where you do well can bring even more than that.