A Microsoft representative told the site: "The 60GB Xbox 360 and the 20GB clearance sale are for the US only. We have not announced any changes in Xbox 360 offerings or pricing in Europe."
The statement is perhaps more conclusive than those which typically emerge from PR departments. It is also worth bearing in mind that Europe has already benefitted from recent price cuts that weren't mirrorored overseas - so perhaps this recent move is simply bringing the US into line with other territories.
However, Microsoft's statement doesn’t completely rule out an upcoming price move on this side of the pond.