People seem to think all communication/networking patents are under the guise of a "fair usage license", similar to the dispute between Nokia and Apple. That is not the case.
The Nokia/Apple patent dispute revolved around the licensing of specific GSM patents, which are a necessity to creating a device that works on that network. Since that is the only way to go about communicating with the network AND are part of the GSM standard, Nokia was required to have them open to license by any company.
Now, in regards to these unnamed patents, some seem to think that they fall under the same statues as the GSM patents. Until we know more about what specific patents Samsung is claiming Apple has violated, we cannot draw a conclusion. That being said, I'm sure Samsung's lawyers understand the difference that I outlined, and wouldn't waste their time with a lawsuit if the above applied.
That being said, if these are in fact legitimate patent violations, Apple put themselves in this position. Samsung didn't file suit against Apple a year and a half ago when the iPhone 4 came out, did they? No, yet they claim that device is in violation as well. Apple's been putting lots of pressure, some of which unwarranted, on Samsung, who, while separate from their mobile division, is a partner. That's just disrespectful.
The short version: watch what you claim. Unless you know the specifics of the patents and the licensing agreements around them, don't spew data points from prior disputes as facts in this one.