New astronomical discovery or hype?

You never know from embargoed press releases--in this case, from the ESA.

The online edition of Nature will publish, on 8 January 2007, a major scientific achievement in astronomy, in which European astronomers have participated, using a space telescope with ESA participation.
...
The script will be online as a PDF file under http://television.esa.int/photos/EbS50295.pdf as of Sunday 7 January, 18:00 GMT.

Via Bad Astronomy and SpaceRef

UPDATE: It was a dark matter survey over time.