I'd like to verify for sure that the version of MKL 11 shipped as part of 'Intel® Visual Fortran Studio XE 2013 for Windows' is also accessible for C++ development (using Visual Studio 2012 and the VS 2012 c++ toolset), or if instead there are Fortran and C++ specific versions of MKL or specific license restrictions?. From looking at the available downloads, I'm pretty certain there's only a single MKL 11 for Windows, but, nevertheless, would like to have this confirmed.
You will have to wait for someone from Intel to give you official confirmation, but I can assure you that MKL is accessible from Fortran, C and other languages, as long as the ABI is followed. I have used many versions of MKL from many versions of Intel Fortran, Compaq Fortran, Intel C, Microsoft C, C++ and other vendors' compilers during a period of over a decade.
There's a "single" version of Intel MKL, callable from Fortran, C, C++, etc., included in Intel Parallel Studio XE 2013, Intel Composer XE 2013 or available standalone.
A specific version of Intel MKL should be the same regardless of whether it's in a bundle or standalone. Naturally Intel MKL 11.0 is different than Intel MKL 11.0 Update 1, which is different than Intel MKL 11.0 Update 2 (currently shipping).
FYI -- please look at this KB article "Which version of the Intel® IPP, Intel® MKL and Intel® TBB Libraries are Included in the Intel® Composer Bundles?' follow this link: http://software.intel.com/en-us/articles/which-version-of-the-intel-ipp-intel-mkl-and-intel-tbb-libraries-are-included-in-the-intel-composer-bundles/. The article should be updated because of there are no info about the latest Composer 2013.