The Speed limit and sign-recognition camera has been around on BMWs for quite a few years, debuting with the F01 7er a few years back and finding its way onto most higher-end BMWs. Many other German automakers also have the same technology now, even something like a Opel/Vauxhall Astra has it as an option.
More than likely, this option is not going to be available in the US, as our road signs are different from those in the rest of the world.
Current Ø consumption (X3):
(325i) *Click on icon for details.