While we here in the States enjoy our AirPort Extreme's newfound speeds, our friends across the pond will be left out in the cold. The UK, Japan, and certain parts of Europe prohibit the use of wide-channel operations so unlike us, AirPort Extreme users won't be able to use the 5GHz frequency that gives the new AirPort its 5x speed boost. It's not sure how fast the new AirPort will work in those countries, but this just makes us glad to live where we do.
Is AI Moving Too Fast? | Future Tech
UK Bandwidth Restrictions to Affect AirPort Extreme Use [TUAW]