general:

• Fixed memory leak affecting every rendered frame (#70)
• Widescreen sizes are now rounded to increments of 8 to avoid misalignments (#60)
• Background color gradient smoothing now has a threshold to avoid blurring intended edges
• Some release build system tweaks (partially from #57 by Margen67)
• tweaked widescreen marker positions

standalone:

• Fixed loading of settings (#45, #53)
• Default latency of WaveOut (the default audio on Windows) has been reduced to 128 (#58)
• Linux and Mac releases are now .tar.bz2 compressed to preserve the execute permissions (#37, #41)
• Mac releases now target macOS 10.14 (Mojave) (#40)
• Included settings file is no longer empty, but contains default input and hotkey settings
• The Windows and Linux packages now include the Super Metroid widescreen patch by ocesse as well as some sample setting overrides (partially by @wojpawlik)

libretro:

• The core is back on the auto updater (by libretro team and community) (#56)
• The core is now also available for some systems as part of releases
• The "HD Windowing (experimental)" setting is now applied properly (#55)
• Support for GB/GBC roms in archives, Satellaview and MSU-1 SGB (by KickMeElmo in #69 (#46))

setting overrides:

• The 4 "widescreen background" settings now allow specifying a line from which on up/downwards the background is widescreen as well as specifying cropping modes
• "WideScreen Marker" setting can now be set via 'm'
• "Mode 7 Perspective Correction" setting can now be set via 'P'
• "Overclock CPU" setting can now be set via 'O'
• Overrides are now properly removed when switching games and not accidentially saves in settings
• The '%'-character can now be used in override files to switch to and from comments

All provided as-is!"bsnes-hd beta" core for RetroArch available in the internal updater on Windows, Linux, Mac, Android and Switch