Intel discussed their plans about Prescott processors at the IDF Fall this year and admitted that the CPU will have numerous differences compared to the current Pentium 4 processors. According to Intel, apart from the faster 667MHz Quad Pumped Bus, 1 MB of L2 cache and the Hyper-Threading technology, the newcomer will also include additional instruction sets, known as PNI – Prescott New Instructions (SSE3 or something?), that are proposed to further accelerate processing of streams. Intel Pentium 4 “Prescott” processors will appear in the third quarter 2003.
The successor of the Prescott will be the Tejas, the most advanced in the whole Pentium 4 family. It will bring a number of new instructions (TNI, Tejas New Instuctions) that will probably concern stream processing as well as the Hyper-Threading technology. It is also likely to feature 800MHz Quad-Pumped Bus and 1 to 2MB of L2 cache. Initially, it will be manufactured using 90nm technology, however, by the end of 2005, the die will be shrunk to 65nm.
Not a lot is known about the successor the whole Pentium 4 family code-named Nehalem. It is said that it will greatly expand the idea of the Hyper-Threading (see the news-story about Intel’s Modular processors), will feature the hardware security LaGrande technology and, as stated by the source, the Yamhill 64-bit extensions. It will still remain to be IA32, but with loads of architectural innovations, I believe. In the second half of 2004 the Nehalem will be made using 90nm manufacturing process, but in late 2005 or early 2006, the novelty will be transferred to thinner 65nm technology.
Since Intel’s architecture of microprocessors usually lives for about 4 or 5 years, we can expect the successors of the Nehalem to be on the market, at least, until 2008. As you may see, IA32 still has enough space to develop. Please note that with the introduction of Yamhill in 2004, Intel will take the step AMD plans to perform in early 2003 with their first x86-64 CPUs.
Please keep in mind that the information is unofficial.