The hardware wouldn't be a stretch. As clever as Portal may be, a large part of that $199 starting price likely comes from the display. Why buy another screen for your home when there's a giant one sitting in the living room? It's not a novel concept, either, as we've seen more than one attempt to bring video chat to TVs.
As it is, this may represent Facebook's best bet on expanding its hardware plans beyond Oculus. Cheddar's tipsters said that projects at Facebook's Building 8 lab aren't all that close to becoming practical realities. The brain interface device (nicknamed Edgefield) is still in the "early stages" with about a dozen people involved, while an armband that turned sound into vibrations has been "shelved" due to development trouble. Portal is a simpler, more grounded product with a relatively broad appeal -- it only makes sense that it would be one of the first devices out of the gate.