From Samsung’s official blog:

Samsung Electronics will file separate preliminary injunction motions in Paris, France and Milano, Italy on October 5 local time requesting the courts block the sale of Apple’s iPhone 4S in the respective markets.

Samsung’s preliminary injunction requests in France and Italy will each cite two patent infringements related to wireless telecommunications technology, specifically Wideband Code Division Multiple Access (WCDMA) standards for 3G mobile handsets.

The second paragraph plainly states this has to do with the RAND patents we’ve discussed before.

The iPhone 4S is scheduled to launch on October 14th for France, and October 28th for Italy.