Well, one of my issues with this - and mind you, I like both and would likely try to get both - is that they are, realistically, just niche groups. Harlequins would have to change a lot to not be smallish "armies." Combine that with the lack of people who'd actually play them, and it doesn't add up to much in sales. AdMech has a better shot at sales because you can tack them onto any Imperial force, but it's still a questionable proposition. Production costs won't be that cheap, and when you're a company already barely maintaining a profit, you can't jump on risks like this when you can just churn out new stuff for existing armies and have it sell well. Just feels like they're not judging the market well.
Of course, these are all still just rumors, and rumors are often not what we expect them to be in the end.