I'm using the nightly build (tonight's 4fb7b5b, for example) and I have come across a small inconvenience using the new Palette docker:

1) Click on a colour in the palette => colour gets selected as expected
2) Use Ctrl+click to pick a different colour from the canvas, or use a different colour from the colour selector => new colour gets picked, but the palette still has the old colour selected
3) If you want the colour from step one back, you can't just click on it in the palette, since the palette still has it selected and clicking on it is a no-op. You have to select a different palette colour first.

I think selecting colours outside of the palette should best deselect any colour in the palette.

I'm not quite sure what the best way to report stuff regarding features in development? Do they go into the bug tracker?

Otherwise, I've been using the palette docker and the Gamut mask feature extensively the past week, and it works really well. I love it!

EDIT: Made a bug report.