Apple’s macOS 10.15 set to clear house

“This fall, the Mac will move fully into a 64-bit world, and with it many old applications and services that users may still rely on today in Mojave,” Stephen Hackett notes for 512 Pixels.

Dashboard isn't the only thing gone in 10.15 — so is 32-bit app & plugin support, Carbon, Ink, QuickTime 7 & QuickTime plugins, PPTP, and hardware RAID. You will get Python 3.7 and Ruby 2.6, at least