It appears that two new Athlon 64 processors, codenamed Oakville and Winchester are reportedly faster than current versions.  Though AMD is pretty hush hush about the whole thing, it seems that 90nm fabrication process may see light of day in these two cores.  AMD has yet to disclose any time frames on these new developments.

The new Athlon 64 microprocessors with code-named Oakville and Winchester cores are reported to be a bit faster compared to the current Athlon 64 processors, the web-site claims citing its sources. The wire says that two Athlon 64 3500+ in PGA939 packaging were compared to reveal if there are any differences in speed, but [no] actual performance numbers are given at this point.