The French guys over at X86-secret have had a conversation with someone from AMD and they obtained some interesting information about AMD his next processors. At the moment only the ClawHammers are in production, they are made on 0.13µm with 1MB of L2 cache and available in socket 754 and 940 versions. This core will migrate to socket 939 in Q2 2004 but will still be on 0.13µm. For 90nm Athlon 64's we will have to wait till the second half of 2004.
The Newcastle which is made on 0.13µm is a stripped version of the current Athlon 64, and will serve to replace the Athlon XP. It will have 512KB L2 cache and socket 754/939. A little later there is the Winchester, this is a 90nm version of the Newcastle.
There is also mention of the Paris core, an even more stripped down version without 64bit support and only 256KB L2 cache memory.