This month a new version of the C standard, C11, has been published. It brings much less changes to C than C99 and hopefully it will be adopted more easily than that. But it will probably still take some time until the major compilers implement it.
Some of the changes that it brings are minor and can already be simulated within C99 or by extensions that some compilers implement already. Some of them already are emulated by P99. I’ll probably post about them one of these days.
The most important to me seem to be two optional additions to the C library: threads and atomic operations.