Merge block has been added in Space Engineers; it allows you to permanently merge ships and stations of the same block size and in proper alignment. When a ship is merged with a station, ship becomes the station. Stations can be now converted to ships, but the blocks which are partially inside asteroids will get damaged or destroyed.
We also added a "news box" on the main menu screen, where you can get notified of anything that is new in the game and we have redesigned and upgraded our multi-player code; this results in a more stable multi-player with less lag.
Full list of new features and fixes: Forums.keenswh.com