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One of them is a WTF mode which has faster matches and a higher number of units than what is presently allowed. A Twitch streamer named gaben_007 has been playing an Underlords build that has unreleased features.
Turbo mode which is probably a feature that allows faster matches. 100's of strings indicate an in-game recording function that will produce images and videos from gameplay which can then be exported. The unit names are Chen, Clinkz, Dark Seer, Dazzle, Earthshaker, Pangolier, Riki, Rubick Arcana, Spectre, Storm Spirit, Sven, Undying, Vengeful Spirit, Weaver and Zeus. Materials, sound files and models for 16 units, each at varying levels of completion. McVicker predicts that many of these features and items will be released within three weeks, but this speculation relies strongly on Valve's weekly release schedule. Among those that we've been expecting, some are further ahead in development than others but it doesn't take anything from the excitement of knowing.
His exploration of the game's files led him to many things that we know are coming and a few others we haven't been told of. With the release of the Proto-Battle Pass in the game's last update, the possibility of finding new things in the game file proved too much of an allure for McVicker to fight.
Thanks to Valve News Network's Tyler McVicker's datamining efforts, new Dota Underlords leaks have emerged, some which could be arriving soon and others that look far from completion.