In regards to the lawsuits (plural) themselves, a quick Google search will give you more details. That's not new info. In regards to the guns going away, that's a completely different matter that has no basis in reality right now.
True, it's assumption. Makes sense when H&K are marketing a G&G MP5 at nearly twice the cost of Chinese imports. This happened with Glocks, though they may not sue. Really, this is looking into the crystal ball and trying to guess what H&K might do. I honestly have no idea, but I'm putting forward a decently educated guess.
First off H&K isn't marketing anything. Umarex is. G&G MP5's have always been more expensive than Chinese models. It's a very different case than Glock. Glock had no interest in being involved in airsoft at all. In addition, their lawsuit was able to use a functional part of the airsoft gun in the suit (trigger safety) rather than just trade dress. H&K already has an agreement with Umarex so H&K airsoft guns aren't going anywhere. Worse case we see some of the clones fade away. I personally have no problem with that. The major companies (except TM) are already playing by the rules.
If this is true its pretty sad, we will be telling our kids about the days when a company beat the competition by creating a better product, not forcing them out of the scene through legal means.
This has nothing to do with competition.