True to the earlier reports about Intel's next chips having HT (Hyper-Threading) and integrated-GPU, some more details about Nehalem appeared on the web, courtesy of Japan's PC Watch.
The architecture diagrams mention about 2 threads per core, which was what I had heard from James Reinders earlier. The PCWatch page also has pictures of the updated Intel roadmaps. It also has features of all the different variations of Nehalem that Intel is going to release. The code names of these are Beckton (Oct-core MP), Gainestown (Quad-core DP), Bloomfield (Quad-core, EE-Desktop), Lynnfield (Mainstream Quad-core) and Havendale (Mainstream Dualcore)
If you can understand Japanese, then go here and read all about it or use a translator and try to figure out what it means!!