I just ordered a Refurbished G4 Mini 1.42GHz from Apple. In your opinion, what are the chances of this coming with the "silent update" (1.5GHz processor, 64MB VRAM)?
Probably 1%. I don't think Apple has probably refurbished any of the 1.5Ghz ones yet, but I could be wrong. Personally I don't think it's likely though.