The addition of game-like elements: points, quests, levels, competitions, achievements, that sort of thing.
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It looks like Humble Bundle will be doing some gamification. One of Reddit users took a glance in the page source code and found a hidden section between "Blog" and "Login / Account" section:
http://i.imgur.com/w1k8Vok.png
Original Reddit thread: https://www.reddit.com/r/GameDealsMeta/comments/4ll5zp/quests_in_humble_bundle/
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