Wolfgang from THG made a writeup regarding Intel's desktop processor plans. While 65nm processors will be launched in 2006 and the Yonah will make its entry as new mobile and small form factor processor it will take Intel until the launch of its next-generation processor architecture before it will be able to dramatically boost speed levels.
The Conroe processor will mean the end of the Pentium 4 NetBurst architecture and will replace the Pentium D 900 by late 2006 (or early 2007).
With the transition from 90nm to 65nm processors scheduled for the first quarter of 2006, the company plans to launch five new product families just for the desktop segment: The 65nm "Cedar Mill" will replace the current 90 nm Celeron D and Pentium 4, the 65nm "Presler", to be named Pentium D 900, will replace the current 90nm Pentium D 800 (Smithfield core), the 65nm "Conroe" is designed to replace the Pentium D 900 late in 2006, and the next-generation Pentium M "Yonah" will be a completely new product for the desktop market.
Read more about the upcoming single-core Cedar Mill, 65nm Celeron D, Presler, Merom and Conroe processors at Tom's Hardware.