Here is my translation for you:
The update 10.3.3 also contained an unrecognized 'code' as here: Power Mac 7.3. No machine yet released form Apple has carried this code name designation. In fact, the current series of powermacs (G5s) have the code name Powermac 7.2. You need to know that the Powermac G4s had the code name Powermac 3.x, the Cubes Powermac 5.1 and the iMac TFT and emacs each had the names Powermac 4.x and 6.x respectively... the complete list of code names can be found here:
http://www.theapplemuseum.com/index.php?id=tam&page=products&subpage=newworld
However, if you look a little closer at the 10.3.4 update, you will notice that mention of a Powermac 8.1 is made, which makes you think that it is not just a minor update but a completely new machine.
You will also find a reference to SMU_Neo2 which might also make you think that the Neo2 would be a new version of the processor. What is certain is that Neo2 would be a derivative of the current G5. But it is still difficult to confirm whether it is a stripped- down version (like the 970fx of the X-Serves) or, BOOSTED!
If you would like to know more, do the 10.3.4 update, open this file:
/System/Library/Extensions/AppleMacRISC4PE.kext/
Contents/info.plist
and search for "8.1".
I shall leave you to dream... (for me the 8.1 is an iMac G5 of new design, to be announced/released ?? at the end of June. As for the 7.3, that will be a Powermac G5 update, on the same date. END of translation.
hope this helps. hope it's true.