As you can see, the email also confirms that the Steam Workshop recently unveiled for Skyrim mods will be enabled for CS:GO as well, meaning that custom mappers will have a more convenient and accessible way to distribute their creations than ever before. It is unclear at the moment whether the Steam Workshop (essentially a Steam-hosted database of user-submitted custom maps and mods) will only allow custom maps or if it will also allow users to upload other modifications such as weapon and player skins, custom game modes, server mods etc.