There Aren't many things that are known to come to the Varia mod, but there's a few, there's a Boss, and a game mode activated with the Story Book.
Bosses/Enemies
 Amalg O' war
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Story Mode
Story Mode is a Game Mode that would only be enable-able if no bosses in the world that it's being attempted to be used in have bean defeated, it IS able to be enabled, but not disabled once it's bean used, it would force the player to fight bosses in order, give some bosses cutscenes, New content, and that's it, but the changes haven't bean implemented yet.