The Modding API has been implemented into Space Engineers. It brings a lot of new possibilities to our modders and it allows them to alter the game by writing C# scripts which have access to in-game objects! Reloadable missile launcher for small ships is also added - with the option to use the conveyor system. Additionally, we have included the Fighter Cockpit model that was created by the modder “Darth Biomech”. This is the first modded model that makes it into the official version of the game.
Full list of new features and fixes: Forums.keenswh.com