Yes, but that may be simply a Valve-owned clone of the XBox360 pad that has become standard in PC gaming. Or it may be the exciting modular device they patented:
http://www.theverge.com/2012/3/2/2840932/exclusive-valve-ste...
Or it may be something to do with Gabe Newell's interest in biometrics.
1. Valve Corporation ("Valve", "We", "Us" or "Our") has developed and produced prototypes of entertainment system hardware and software, including a set-top box running custom software and a game controller
A game controller...