Yeah I don't know what they're up to. I've used them as a useful shorthand example for automation for awhile, but you're right I should perhaps find a new one because they seem to be in some sort of limbo, crunchbase has nothing after their seed funding.

A more concrete if less evocative example is Amazon's warehouse automation. Relatively simple robots with 3 DOF (2D planar movement + a container jack) are wiping out enormous numbers of jobs, both in obvious immediate effects (less fulfillment center jobs) and by decimating conventional retail.

edit: Momentum still has 19 employees on LinkedIn, so they're not completely dead it seems.