those are just code names ... When it’s released, it will be called “Byzantium”.
In 2010, AMD said it plans to release eight- to 12-core 45-nm Opteron processors code-named Magny-Cours, and in 2011, 32-nm 12- to 16-core chips code-named Interlagos.
The new processors will run on a new platform, code-named Maranello, and will require a new socket, which means they won't be drop-in compatible with current systems.