The layers list and the Dopesheet channels now show color swatches for both the stroke and fill colours now. This is useful when you've got layers that only use either/or. * Currently, these only get shown if the relevant opacity setting is high enough for that aspect to contribute to the result. * The sizing of these items could do with some more tweaking (especially in the Dopesheet), as these may now be too small to accurately see and/or interact with. * There are some potential issues when using near-gray (or actually, colours similar to the list backgrounds, but that issue exists in other areas of Blender anyway. (NOTE: At this stage, these changes are still experimental, and not for 2.73 yet)