As for what is new, there isn't actually all that much. I haven't found a definitive list, but a brief summary can be found at http://isocpp.org/wiki/faq/ (look for the 'C++14' section).
What problems are you getting? You need to specify in the compiler options that you are using 'LLVM Clang Compiler', and since Clang doesn't come with the standard library last time I checked you will need to link it to one (preferably libc++, but it doesn't work fully on Windows yet so you can just give it the GCC libstdc++ one).