In the past, creating new releases of TileMill was long and arduous process. With the future release of TileMill 0.11.0, builds will be automated on travis. Very few changes should be visible on the surface.
The biggest change is that TileMill 0.11.0 is wrapped in atom-shell, similarity to Mapbox Studio.
Report to github.com/mapbox/tilemill/issues/new and apply the milestone atom
The pull request is staged and can be viewed here: https://github.com/mapbox/tilemill/pull/2482