AMD unveiled it's working on a native eight-core processor called Montreal. This chip is expected to be launched in 2009:
We were surprised to learn that despite the rumours going around, AMD's eight core CPU is actually a native one. AMD can do native octa core just as well as Intel can with its Nehalem and the codenamed for this eight core monster is Montreal. This comes from a highly ranked source at AMD.
So Montreal is not just two Shanghai quad cores stitched together, it's a native octa core 45nm part. This makes sense for servers initially and eventually it will also launch for the ultra high-end gaming market.