Drag-and-Drop Swatches to Artboard
This functionality wouldn't change the swatches palette it, but would allow users to drag a swatch to the artboard and drop it. You could tile several to create a tonal family or brand color set.
Being able to scale them larger, arrange them, reformat the grid, turn the white gap off in between colors would improve color adjustment and comparing hues side by side. They'd function like the existing swatches panel in that you could have a shape or stroke selected and apply the color by clicking the swatch on the artboard.
This would help in color exploration and creating effective color themes. Save common color usage in your workspace set up, export out as a group, share via Libraries, copy and paste artboard swatches to another file etc.

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Nick commented
Be able to select a swatch and be able to add a chip of that colour to the artboard which displays the colour breakdown information (CMYK, RGB, etc) or specific colour name/number (Pantone). This would be useful to show what colours an artwork is made up of or for colour reference.
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Lene Madsen commented
As a designer i really need a feature that makes it able to drag a swatch or a color group (ex. a Pantone swatch/colorgroup) onto the artboard and then be able to make a colorcard with a colored square and a textbox with the choosen color(s) color codes beside the square.
We do this manually and it takes a lot of time. We really hope this can be something we in the future could do automatic.