Quick heads up – VS2013 Ultimate with UE 4.9.2 and complex project, can coexist nicely with VS2015 Enterprise with UE 4.10.0 and the same project (but in different directory)
Just keep installations in separate directories, and git to push/pull ‘trial’ 4.10 setup of your project, while maintaining active development on 4.9 until ready to switch.
focus on ‘stability and upgrade to VS2015’ appears to have left most of the C++ specifics intact and in perfect working order.