Ingrid Lunden explains the significance of the deal (I dislike her headline though, since it falsely implies Google and Samsung were at legal odds):
First, the deal will bolster both Samsung and Google’s patent positions against patent infringement allegations and subsequent litigation from competitors, and specifically Apple, which has been involved in acrimonious, multinational patent battles worth billions of dollars against Samsung for years now, over Samsung’s Android-powered range of Galaxy smartphones and tablets.
Second, it is a sign of how Google continues to put the patents it gained from its $12.5 billion Motorola acquisition to good use across the Android ecosystem. The ecosystem part is key here. I personally wouldn’t be surprised to see deals like this one appear with other OEMs.