One things forsure NECA seems to be way more confident in their Rocky line than Rambo.
Not necessarily, despite 3 series of figures, there's only been 1 unique Rocky and 2 variants in each, paired with an oppenent and variant. Odds are any Rambo line will just be him, so maybe with some luck, they're just trying to spread things out instead of being done in 1 or 2 waves.