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From the game's page...
https://www.gog.com/game/shovel_knight

Shovel Knight: Treasure Trove is the full and complete edition of Shovel Knight
[...]
Shovel Knight: Treasure Trove also features three additional campaigns that are games all unto themselves! Take control of Plague Knight, Specter Knight, and King Knight on adventures of their own! Together, they form a grand and sweeping saga!

With a fully cooperative campaign, a full-featured challenge mode, a 4 player battle mode, and body swap mode, you’ll be digging for a long time.
Well... those things don't actually exist yet. And there is nothing in the description saying it is "coming soon". It implies that all of that stuff is already there. It is not.

Shouldn't there be some sort of clarification? (Or am I missing it? My apologies if I am.)

edit: Nevermind. Looks like the update arrived, and this post is no longer relevant.
Post edited April 06, 2017 by AgentBirdnest