CCP has pushed back the launch of the Tyrannis free expansion to EVE Online by one week, to 26th May.
You'll have to wait longer still to access the expansion's marquee feature - the development of planet surfaces. The market seeding of Planetary Command Centres won't start until 8th June.
"This will allow the development team to finalise polish on the features and players to have a period of time to study the new gameplay, scan planets for resources, train skills needed for structures and make plans for which planets they want to develop," said the Icelandic developer.
However, EVE Gate, the oft-renamed web-based social portal for the game's universe, will be available from the 26th.
There's more info in a post on the official site by senior producer Torfi Frans Olafsson.