https://www.bitwig.com/en/18/bitwig-studio-2_4.html
In a nutshell, here's what's new:
- Sampler overhaul
- Extended MIDI channel support
- New modulators: ParSeq-8, Note Counter
- New devices: Note FX Layer, Channel Filter, Channel Map
- Resizable tracks in Mix view
- Resizable scenes in Arrange view
- Colorable scenes
- Controller take-over modes
- On-screen controller visualization
- Interaction-based hints
- New quick start templates
- Modulation workflow enhancements
- New artist package: Claude Young - Cinematic Synth Sounds