Chips codenamed Manila, Orleans and Windsor are scheduled to be released in Q1 of next year - these are claimed to be Semprons, Athlon 64s and Athlon 64FX dual core chips.
This web site also suggests that they will support "Presidio" and "Pacifica" security and virtualisation tech, and DDRII-667.
This site also claims to show roadmaps which have schedules that include Athlon 64 X2s clocking at PR speeds of 4800+ and above, as well as future flavours of the Athlon 64 FX with odd numbers up to 61.
More details are here.
Meanwhile, over at this Japanese site, there are details of AMD San Diego and Venice processors clocked at 4000+ and 3500+ PR speeds, with pictures of the said chips. µ
See Also
Future desktop AMD core roadmap tips up
AMD readies Taylor, Trinidad and Sockets S1, M2