Find out what dangers race conditions in general and C++0x data races in particular pose to your concurrent code, as well as the strategies for avoiding them.
Templates are one of the most powerful features in C++, and variadic templates make them even more powerful. Variadic templates in the C++0x standard library can greatly simplify the writing of type-safe code with variable numbers of arguments.
The new standard will support multithreading, with a new thread library. Find out how this will improve porting code, and reduce the number of APIs and syntaxes you use.