Pictures released on Twitter and Facebook suggest that Infinity Ward is developing for the Piston
Infinity Ward appears to be working on development for the Valve-backed Piston console from Xi3. The developer has posted two different pictures (one on Facebook and one on Twitter) of what appears to be a Piston with Infinity Ward branding on it.
While there is no definitive confirmation on whether or not this is indeed a sign that Infinity Ward is developing for the Piston, it sure seems to suggest it. The Piston made a big appearance during CES 2013 and even fooled a lot of people into thinking that it was the actual elusive Steambox.
Valve has invested a large but undisclosed amount into Xi3 for its work on one of the many Steambox consoles.