Windows 10 build 17661 (rs onecore dep uxp dev.180503)

Windows 10 build 17661 (rs_onecore_dep_uxp_dev.180503) is an unleaked build of Windows 10 October 2018 Update. It was showcased in the session "Rapidly Construct LOB Applications with UWP and Visual Studio 2017" at the Microsoft Build 2018 conference.