I recall back in third edition there was a global campaign for 40k for Armageddon. I participated in it some, and it was a lot of fun. It looks like a new campaign, one for the Eye of Terror may be coming to us very soon, and I think it would be a welcome event.
Please remember that these are rumors. Please check out the Blood of Kittens site, for more information as well, as I did not bring the entire article over, just the highlights.
via Tasty Taste on Blood of Kittens
Anyway, the real leak and depending on how it shakes out is the upcoming Games Workshop sponsored Global Campaign.
Word is coming in that Independent Retailers will be given details on Global Campaign for players to run. an Eye of Terror campaign for a new generation.