1. Already on my todo list (planned for next year)
2. Paintable masks - we already have it, you can change any layer into a mask and paint on it.
3. Vector tool - next year
4. Channel editing - users haven't requested that so far
5. Noise reduction - current "Denoise" filter is really good, especially in "Precise" mode.
6. Plugins - this is not easy to implement, we will consider that in the future.