The big news is that Linux Mint 18 will offer Cinnamon 3.0 and MATE 1.14 flavors. While Cinnamon 3.0 is still in the heavy development, the MATE 1.14 major release was announced a couple of days ago with numerous enhancements in various areas, including updated GTK+3 support. As for the new icons and theme, Linux Mint 18 should ship with both Mint-X and new Mint-Y (not the final name) themes, the latter being based on the popular Arc GTK theme and Moka icon set.
Some of the products that appear on this site are from companies from which QuinStreet receives compensation. This compensation may impact how and where products appear on this site including, for example, the order in which they appear. QuinStreet does not include all companies or all types of products available in the marketplace.