Load Steam and see what's in the Update News.
Why, it's the Weighted Companion Cube Plush!
So there's everyone's questions answered about how they'll make it: squishy. Apart from how big it is. But if those super-tasteful rear-view mirror cubes are anything to go by, not quite life-size.
Um, Valve, you know how we love you forever and ever and everything - can we pre-order one? Um, four?