From AMD's Press Release:
AMD today announced that the worldwide introduction of its next-generation, 64-bit AMD Opteron™ processor for servers and workstations will take place on April 22 in New York City. AMD plans to follow up with the introduction of the AMD Athlon™ 64 processor for the desktop and mobile markets in September 2003.
AMD also announced today that it will introduce the AMD Athlon XP processor 3000+ on February 10 and the AMD Athlon XP processor 3200+ in mid-2003. These processors, based on the core code-named "Barton," feature additional integrated cache memory for industry-leading performance.