As many of us know (and many, many more don't), C++ is currently undergoing final drafting for the next revision of the International Standard, expected to be published in about 2 years. Drafts and papers are currently available from the committee website. All sorts of new features are being added, the biggest being concepts and lambdas. There is a very comprehensive Wikipedia article with many of the new features. GCC 4.3 and later implement some C++0x features.
As far as new features go, I really like type traits (and the appropriate concepts), but my definite leader is variadic templates. Until 0x, long template lists have involved Boost Preprocessor usually, and are very unpleasant to write. This makes things a lot easier and allows C++0x templates to be treated like a perfectly functional language using variadic templates. I've already written some very cool code with them already, and I can't wait to use them more often!
So what features are you most eagerly anticipating?