Recently I joined the project in order to help with polishing buildings and their animations, also I will provide a big range of units with bugless skeletons, clean sanity, merged portraits and additional animations. Units and buildings is our priority, and we're not looking towards icons right now because we think that they are still quite fitting as well as UI.
Maybe later, when we have more content set and done, we'll look from distance on that and find the things we'd like to improve, like icons. However, we think that it will be quite easy to enlarge them with AI tools and squeze back to 64x64 to get a quick improvement. But we always want to save as much original warcraft feel as possible when working on improving the quality.