Core C++11 has changed significantly. It now supports lambda expressions, automatic type deduction of objects, uniform initialization syntax, delegating constructors, deleted and defaulted function declarations, nullptr, and most importantly, rvalue references — a feature that augurs a paradigm shift in how one conceives and handles objects.
The C++11 Standard Library was also revamped with new algorithms, new container classes, atomic operations, type traits, regular expressions, new smart pointers, async() facility, and of course a multithreading library.