C++11 (formerly also known as "C++0x") is the current standard for C++, adopted in August 2011. Many parts of it are available in GnuCpp version 4.3.0 (or later), by Microsoft Visual C++, by Intel's ICC, and by many other compilers.
The Language
For later developments in CeePlusPlus standards see CeePlusPlusOneWhy.
'C++0X' looks a little like a dead fish.