As with everything it does, Valve plans to tinker with the Steam Controller as many times as the creators and the users deem necessary until it's complete. Those who were in attendance at Steam Dev Days on Wednesday were the first to learn that Valve is planning to readjust the ABXY buttons on the Steam Controller into a diamond layout, similar to the design of most modern home console controllers. This should limit compatibility issues for classic titles.
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Valve rethinks the Steam Controller, makes it look more normal