Important features coming in December/January:

• Link projects and backlink down to sub-board level(shipped)
• Improved card experience(shipped)
• Added audio playback and annotations on whiteboard(shipped)
• Add Unified annotations across PDF/cards/video/audio in Library(shipped)
• Drag&drop annotation to card(shipped)
• Sticky notes(shipped)
• Optimized mindmap(shipped)
• Better global search
• Automatic data backup(shipped)

Planned:

• Toggle heading and tables in cards
• New "web bookmark" type in Library
• Web app 
• Mobile app
• Properties and Filters
• Standalone window for Card/PDF/Video etc
• Hierarchical structure for whiteboards within projects
• Add caption to images/videos/files on whiteboards
• Audio player and Audio annotation
• Web browser in sidebar
• Templates for whiteboard
• Video highlights on Google drive's video