This week's Deadlock patch offered a brief peek at 3 unreleased heroes before a hotfix shoved them back behind the curtain

pcgamer.com:

It's only been a week since Valve officially acknowledged Deadlock's existence, and gaming's least-closed beta test is already changing quite a bit. Yesterday, Deadlock got a hefty patch that added wall-jumping and more than a hundred hero balance tweaks, because the third person MOBA shooter wasn't already complicated enough without elaborate parkour. Also included in the patch is a new profile screen, showing statistics from a player's playtime with different heroes, which—as some eagle-eyed Deadlock enthusiasts noticed—included three heroes that we can't yet select in-game: Holliday, Mirage, and Wrecker.

A hotfix arrived shortly afterwards that removed the unimplemented heroes from the profile statistics page, but players snagged some screenshots as proof. Better still, while those heroes might not be visible in in-game menus, it's possible to try them out in Deadlock's sandbox mode using a few console commands. It seems safe to assume these three will join the existing roster of 21 at some later point.

After pulling up Deadlock's console (bound to F7 by default), entering the command «dump_hero_names» will return a list of all heroes that are at least partially implemented, including the unfinished heroes that were briefly glimpsed through the new profile screen. While in the hero Sandbox, entering «selecthero hero_[name]» will switch your character to the specified hero, even if they can't normally be selected. With those console commands, you can get some early practice with Mirage, Wrecker, and Holliday. You'll have to use the name «Astro» for Holliday, though.

As you can see in these clips from @IntelDeadlock on X, Mirage looks like they'll have a desert-themed ability kit, letting them launch tornadoes to toss enemies into the air, fire beetles that'll slow enemies in a location, and shoot off a projectile that'll tether an enemy player to other players nearby.