I just upgraded to UE 4.12.2 and was going through the Programming Quickstart but when it starts VS it is starting VS 2013 instead of VS 2015 Community which I also have installed. Also, another little issue that I noticed was when UE is creating the Basic Code project, the status window is being located so that it is displayed so that it is split over two monitors. I have a multi-monitor system with three monitors.
I exited everything and restarted the Launcher and Launched UE 4.12.2 again and now when editing my C++ files VS 2015 is being selected.