New Features and Enhancements

• Support for the Touch Bar on MacBook Pro.
• Track Alternatives let you create and switch between different playlists of regions and edits on a track.
• Render any combination of effect plug-ins to a selection of audio using Selection-based Processing.
• Share to GarageBand option allows you to remotely add new tracks to your Logic Pro project from your iPhone or iPad via iCloud.
• New region editing design reveals waveform for entire audio file, or unused MIDI data, while trimming.
• True stereo panning provides more control and discrete manipulation of stereo signals
• Projects can now contain up to 256 busses.
• Logic Pro now offers a 64-bit summing engine.
• Import Music XML files.
• Insert plug-ins as either stereo or dual mono on stereo tracks.
• Expanded color palette offers 24 more colors to label your regions, tracks and notes.
• There is now a key command Create New Track with Duplicate Settings and Content. The same action can be triggered by Command-clicking the New Track with Duplicate Settings button in the track header.
• The I/O plug-in now has a Mix control.
• There is a new Recording page in the preferences window, which now has the settings for Overlapping recordings, recording file type, and recording bit depth.
• There are now key commands to move the locators forwards and backwards by one bar.
• There is now a control for horizontal auto-zoom in the Main window, Piano Roll, Audio Track Editor and Step Editor.
• There is now a key command to create a new Arrangement Marker.
• There are now key commands to toggle the disclosure of the currently selected track stack, or all track stacks.
• There are now key commands to create a new project alternative and to edit the current alternative.
• There is now a preference setting to adjust the brightness of the backgrounds in the Tracks area.
• There is now a key command to close Track Stack folders on the currently selected track.
• There are now key and menu commands to apply the last fade edit to selected regions.
• Key commands can now be used to apply one of up to 30 Transform User presets.
• There is now a command Move Movie Region to Playhead, available as a contextual menu item and key command.
• It is now possible to set the sample rate when creating IRs in the Impulse Response Utility.
• There is now a key command Repeat as Alias.
• Disk Space management is now fully supported on macOS Sierra.
• There is now a key command Show Movie in Finder.
• There is now a key command Diatonic Insert in the Score window.
• There is now a Key Command for Apply Default Crossfades.
• There is now an option in the Overlapping Recordings preferences to select between replacing MIDI regions, or just the content within existing regions when recording in Replace mode on MIDI tracks.

Source: support.apple.com