In the early days of the year, Diamond (the mayor and pretty much only distributor of direct market stores) raised it's threshold order numbers for publishers in a substantial way. In the same move, they also removed the adult supplement of Previews. What this meant is that if a certain title did not reach that certain threshold, they would no longer appear in the Previews catalogue.
Wednesday Comics was the latest in a series of weekly comics from DC, in this particular case in an extraordinary "newspaper" format that was meant to reminisce readers of the old comic pages of yesteryear. To back this concept up, DC tapped a bona fide selection of creators, including such heavyweights as Neil Gaiman, Dave Gibbons, Kurt Busiek, and many others. The series was an anthology that would feature one page of story a week (and one of them, Superman, was even published USA Today) and it received an intensive publicity campaign.
It happened during San Diego Comic-Con. Rumblings of a huge announcement were hinted at days before, and some speculators guessed it, but no one believed it until they announced it: Marvel purchased the rights to the legendary character Marvelman (later known as Miracleman). The character's history of legal problems and trials is incredibly complicated, but Marvel seemingly worked through it (somehow, we still don't know all the details).