MacRumors.com

Architosh posts some details and speculation on Motorola's upcoming processors. Much of the information from this report as well as the afore mentioned German report appears to be have originated from a PDF (pulled) that was posted on Motorola's site. That particular document has since been pulled. (Local mirror of PDF: here)

The essense is captured by Architosh in this summary:

It appears from this road map that the next Motorola "G-something" processor will be a G4, its model number being MPC7457, with a MHz range between 867-1833MHz. This chip is based on a SOI (silicon on insulator), .13micron process and appears planned for sometime in 2003. The MPC7457-RM chip, planned for 2004 is more mysterious and includes RapidIO.

The article also attempts to pull together older rumors, and provides some unrealistic predictions of upcoming PowerMac releases.

Reference to the PDF was previously made in this thread with a screenshot of the since removed PDF. Another Motorola PDF was referenced by MacOSRumors.com and indicates that future processors will use RapidIO as their interconnect technology.