From looking through the various countries, it looks like there are at least four versions of the Bing homepage: a "US" version with hotspots (which very rarely actually shows US locations, but it's the version you get in the US), a British version with hotspots, an Australian version with hotspots (or is this one tomorrow's US version?), and an "everywhere else" version with no hotspots. All three show different pictures. Today, the US version's showing Central Park in NYC, the British version's showing the Tower Bridge, the Australian version's showing Paris, and I don't recognize what the "everywhere else" version is showing.
Looks like Canada and France (and maybe some others; I didn't look through the whole list) get the US version and the British version is exclusive to Britain.