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According to some tweets by those in attendance at Steam Dev Days, Valve will soon include DualShock 4 support via Steam. There was no firm release date set for this but it was accompanied by word that additional controller support will be coming later.
From the looks of things, this will utilize the same interface that the Steam Controller uses for creating custom configurations.w
From the looks of things, this will utilize the same interface that the Steam Controller uses for creating custom configurations.w