GCC 4.8 is the big Free Software Foundation compiler update coming one year after GCC 4.7. Jakub hopes that GCC 4.8.0 will be in a state for releasing by the end of next week.
GCC 4.8.0 brings improved support for C11 and C++11, various other language handling improvements, code generation improvements, new optimizations, and much more.
Some of the GCC 4.8 features that immediately come to mind are a new optimization level, some performance improvements, initial support for Intel Broadwell and its new instruction set extensions, various ARM improvements, AddressSanitizer and ThreadSanitizer, some C++1y support, and its codebase has been converted to C++. More Phoronix articles in the coming days will share other GCC 4.8 compiler features.
The GCC 4.8 release candidate announcement can be read on the GCC mailing list.