They now come in red and I think black as well as the OD green. I have already talked to Romeo about faction symbols for all the liscensed bags. But please mention it as the more people who do the more likely it will become reality.
As for the small slots the models I have that fit them are; Sebastian, canines, papa loco, alps, stitched together, and ice gamin fit in the small slots. I think most of the gremlins will too but I don't have any. I don't think the smaller slots are that big of a deal.
I play a few other skirmish games so the generic slots work great. I am planning on getting custom cut trays for all my minis by faction so I can tale what I please. Those that don fit in the bag get stacked on a shelf. the generic trays are great but you can pack (no pun intended) way more minis into custom foam though you do have to wait a bit longer for it.
This is also the second time I've heard of "battle foam grief". My whole club combined has two or three of each bag. I haven't heard any complaints other than one of our guys had prototype foam before they released it to the public and even though he got it at a cut rate they replaced it for free.