Appleinsider claims that IBM is currently producing 90nm G5s in volume at speeds of 2GHz, 2.2GHz, 2.4GHz and 2.6GHz.
Apple is expected to announce these new G5 processors in speed bumped PowerMacs at the January MacWorld Expo according to one source at Appleinsider.
This would be consistent with previous rumors and whispers that the low-end PowerMac would become a single 2.0GHz G5.