In no particular order or estimated delivery time:
end-to-end 10-bit video processing on the CPU (subset of filters)
color management on the CPU
text-to-speech
remote HTML generator (Chrome DevTools Protocol)
integration for external editor (e.g. Audacity, GIMP, etc. via configurable launcher and file watcher)
duck audio
make it easy to add 0.5 or 1 second transition on timeline
audio noise reduction
open HEIC images (already works on macOS, work-in-progress in FFmpeg)
hardware accelerated decoding for GPU Effects
read Kyno XML for name, comments, tags
SMPTE 2084 PQ HDR
HDR preview
additional editing modes/operations (slip, slide)
fullscreen playback on current/single screen with on-screen controls
project media management (automatically copy or move to project folder, automatically convert)
set metadata (artist, title, etc.) in export
archive project
raw video processing - e.g. CinemaDNG
multi-camera editing features
convert generator UIs to QML
add keyframes for generators
add partik0l generator
circle VUI control for Vignette and Crop: Circle
generic filter UI (MLT service name and table of parameters)
OpenFX and VST2 plugins using generic filter UI
multi-track transition
generic transition (MLT service name and table of parameters)
add CMX EDL import
add Kdenlive XML export
add OpenTimelineIO import/export
add presets to Filters search
add option to view timeline waveform per channel
add transitions to Playlist
add speed param to Export > Codec
add option to reduce number of encode threads for Convert, Reverse, and Proxy jobs
improve the appearance of video-with-alpha clips by showing with checkered background in source player
background removal
universal search
simple screen capture through libobs or ffmpeg
add a base VUI that adds indicators for in and out points and a toolbar to invoke filters:
Text, Size/Position/Rotate, Crop, Color, Chroma Key, White Balance
improved UI for nested projects (MLT XML clips)
multi-select support for Properties
multi-select support for Filters
option to include intermediate thumbnails in timeline
ability to set the poster frame for a clip
add Recent and Most Used tabs to Filters chooser
typewriter effect for Text: Simple and Text: Rich
more columns and sorting in Playlist
clip markers or flags
turn off all effects switch
aspect ratio lock for VUI rectangle control - e.g. when used with Crop: Rectangle
motion blur for motion-animated things like Text and Size/Position/Rotate