What does the German case have to do with the US case?
It speaks to the patent's validity. It also points out some of the US court system's foibles.
2013 - The German (and Dutch) cases were decided by judges with technical backgrounds, who looked at the prior art and quickly invalidated the slide-to-unlock patent.
2014 - The US case was originally decided by a lay jury, who... without such technical background, and without seeing the prior art... apparently put a lot of stock in the fact that the patent was granted, not realizing that doesn't necessarily mean it actually should've been.
2016 - Later on, a set of three patent knowledgeable US judges threw out the jury verdict and invalidated the patent.
2016 - Six months later, a different set of judges surprised everyone by (totally out of the blue) deciding that because the three judges above had seen more prior art than the jury had, the jury verdict... which was based on less evidence and knowledge... should be reinstated. They also refused to hear more evidence themselves. In short, they cared less about actual validity, than about legal technicalities.
- The original three judges filed dissenting opinions designed to give Samsung ammunition for a SCOTUS appeal. Moreover, most of the patent legal community... including the nation's top authority on patent law... also is upset with that set of judges weakening the obviousness test for patents, something which goes against a previous SCOTUS ruling. Not to mention refusing to hear more arguments before making such a surprising decision.
It was so controversial an action, even Apple's own counsel seemed surprised.
See:
http://www.fosspatents.com/2016/11/federal-circuit-unsurprisingly-upholds.html
Thus we come to today, where everyone is wondering if / how Samsung will file an appeal to the Supreme Court.
It is important to read the original article:
http://www.fosspatents.com/2017/02/samsung-is-now-taking-second-apple-v.html