Once again here is my thread where people can post any issues and solutions they encounter for updating to the latest version of the World-Leading Best Most Amazing Game Engine in the World, UE4!
**FCanvas**
FCanvas has been moved from its own class file into CanvasTypes, and has massive improvements!
FCanvas::Flush should be replaced by: FCanvas::Flush_GameThread();
Plugins
the IModule file is now manditory, see my thread here for more info if you get any errors compiling your plugins