C++0x has long been in development and various compilers -- including GCC -- have supported various parts of it in draft form up to this point. With the unanimous approval, the Geneva-based standards organization will now prepare the final C++0x document. When released, C++0x is expected to officially be known as C++11. This should be done by the end of the calendar year.
The message citing the unanimous ISO approval can be found in this blog post. Those not up to speed on C++0x (or C++11 as it will be called) can find out some information on Wikipedia.