It is not tied to Rebels, the figures come from all the sources.
I think my favorite was a tusken with gaffi stick that mimicked the classic "guy with bayonette raised over his head" army guy. There is a Star Destroyer remote control thing too... definitely not just Rebels.
And they are different from mini-unleashed since they are single-color, dirt cheap army men (only Star War characters). If you've ever played with army men, you'll seee they replicated so many of the "classic" poses - sniper, medic, officer with pistol drawn, etc.