Apparently, the pushback has been working. The API deprecations scheduled for June 19, 2018 have been delayed indefinitely, Tweetbot creator Paul Haddad tells TechCrunch.
What’s New in Version 5?
GIF support in compose view (Powered by Giphy).
Redesigned profiles.
Redesigned tweet status details.
New iconography and app icon.
Optimized dark theme for OLED displays.
Support for haptic feedback.
Auto video playback in the timeline (which can be disabled in the settings).