Samsung had already announced in a court filing that it was going to take on the iPhone 5 for suspected violations of patents it holds, and the company has stayed true to its word.
Apple Insider is reporting that this week Samsung officially added Apple's latest smartphone to a different lawsuit than the one Samsung lost last month. This lawsuit is the same one in which Apple was granted an abbreviated preliminary injunction against the Samsung Galaxy Nexus being sold in the U.S. Samsung is alledging that Apple's iPhone products violate two UMTS standards patents and six other feature patents Samsung holds.
The report states that Samsung obtained an iPhone 5 as soon as the smartphone was available, then determined that it has "the same accused functionality as the previously accused versions of the iPhone."
This trial is currently very young, and is still deep in the discovery phase. It's likely that Samsung may even get the chance to add the next version of the iPhone to the lawsuit, as the trial isn't scheduled to begin until 2014
Samsung recently lost a different patent dispute to Apple. In that lawsuit, Samsung was ordered to pay Apple $1 billion in damages, though the judge in that case did lift the U.S. sales ban on the Galaxy Tab 10.1 that had been in place since June.