If that's the correct translation for it (I read it in Blabbermouth, probably translated in google or something), then i guess the negotiations with Metallica failed.
Why? Because the European tour was finished some time ago and then, in the last days of February, an Irish date comes out of nowhere. They only announced the date (August 1st) on that time, not even the venue, the support bands or tickets. And later the venue even changed...
So I guess they were in talks and Metallica were slated to play August 1st (?).
About the rest, why are they teasing with bands like Slipknot if they don't need to sell more tickets? And Manowar...that's a direct attack to Hellfest saying "we have them too". Oh well, Wacken is already sold out, there's no need for games...
It was nor really the correct translation. But the facts are in it...it just made it kinda ridiculous, because Slipknot is the band, that i would like to see least of all metalbands. And these negotiations "maybe 09, maybe 10..." are also nothing but ridiculous.