There should not be any issues with using Visual Studio 2013 for APP SDK Samples. Although this has not been tested as VS 2013 is still in preview phase. APP SDK Samples will certainly be supported for it, once a stable version is released.
FYI, only a provisional OpenCL 2.0 spec has been released so far (probably a month back), so do not expect those cool features any time soon. IMHO the actual spec will be released in approx 6 months, and only after that vendors may claim their support for OpenCL 2.0.