Telltale Games has been teasing gamers with mysterious missing persons clips, and another clue may have emerged for DLC for The Walking Dead.

The Steam Database has a listing for The Walking Dead 400 Days DLC. The database isn't official, but it accesses Steam info from Valve's own SteamKit2.

Also, Telltale has been posting clips on a Vine account (below) showing what appear to be missing people, with the number 400 flashed in the different clips. Perhaps these are the characters involved in the DLC.

Season Two for the Walking Dead is expected in the fall.

[Source: The Steam Database via All Games Beta and Joystiq]