Image credit: Valve A possible Steam controller release date has appeared online, indicating the much-anticipated hardware release from Valve may be about to hit the market. In a now-hidden article by Japanese gaming outlet 4Gamer , the Steam Controller came with a 4th May release date. Whilst not confirmed by Valve, it’d certainly make sense for the release date to land soon: there have been hardware previews for the Steam Controller since last week, so it makes sense that the company is gearing up for a release soon. Here's the reveal trailer for Valve's Steam Controller and Steam Machine. Watch on YouTube The 4gamer leak comes after a couple of other bytes of information about the hardware cropped up over the past week or so. One gaffe came from the patent company itself, as Valve uploaded a currently-unviewable Steam Controller unboxing video to Steam a week ago, and there was also a massive shipment of wireless controllers discovered in public corporate shipping records earlier this month.…