"K10 is the name of the new architecture that new processors from AMD will be using, like the forthcoming Phenom and the Opteron based on the much expected “Barcelona” core. In fact, a lot of people are making a big confusion calling K10 architecture as “Barcelona”, while Barcelona is only one of the CPUs that will use this new architecture. In this tutorial we will explain what is new on the K10 architecture and will also present a complete AMD roadmap showing all products based on K10 architecture that are planned so far."
Check it out at Hardware Secrets.