Deadlock's recent patch is a big one. There are big hero changes, map redesigns, and six new heroes for players to check out if they've got 50 games under their belt. Although these won't be added to ranked or casual play for some time, don't worry—you won't be at a disadvantage...
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Deadlock adds 6 new heroes only available for veteran players, but none of that matters anymore because Valve has renamed Slork
Source: PC Gamer (opens in a new tab)