Yacht Club Games currently has two more campaigns in development, and they’ll be released for free.
Last year the first free campaign, Shovel Knight: Plague of Shadows, was released. The studio is now working on campaigns for Specter Knight and King Knight too. Specter Knight will be coming first, although the team is working on all upcoming content simultaneously.
Specter Knight’s new abilities include a slashing attack, which can also be activated in mid-air for a "Dash Slash." He also has a wall climb, however he can only climb a set distance before falling down again, so you’ll need to use abilities in combination to reach new heights.
Source: IGN PC Articles
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