He means the jumper pack for PathFinder. The ones that propels you forward.
They keep changing the name of it. I just looked and it is now called the Thrust Pack.
Had a go with some of the new infiltrator stuff and it looks pretty good. I've not played infiltrator much so I can't comment on it really, but the knives are amusing and the smoke grenades/jackal look like they could be good for the base camping harass infiltrator.