A new entry for something called the Steam Trading Card has appeared in the Steam database.
An image accompanying the listing shows the text "Steam Trading Card beta access" in a style similar to the other community tools currently available on the PC, Mac, and Linux digital distribution platform. The Steam Trading Card entry was previously filed in the Steam database as CookiesTestApp20352.
Users can already trade in-game items and Steam gifts with each other, as well as sell certain items for Steam Wallet money using the Steam Marketplace.
One popular theory on the Steam Forums is that Valve is making an easy-to-use method of identifying reputable traders across its various community marketplaces.
Another common idea is that Valve might be working to introduce support for trading card games into the Steam framework. Blizzard is currently working on a trading card game of its own with Hearthstone: Heroes of Warcraft, and other TCG's like Magic the Gathering are already available in some form on Steam.
Valve has recently been experimenting with the VR headset Oculus Rift, patching support for Team Fortress 2 and Half-Life 2 for the device. The company is also working on producing a Steam Box computer designed to sit under a television in a living room.