The Official Metallica Site posted a message from Lars in danish. This is the english translation:

“Hello from a beach in Mexico..Happy Easter. It's the Danish branch checking in (with a 'd'.. says the miss, without interfering!)... I feel extra Danish today.. Gasoline is playing on the iPod (Fi-Fi Dong!) and I would therefore share with you that we will make the Århus day a Danish day... drumroll, please.. We have asked the cool Danish bands Volbeat and Mnemic to join us the 13th of July and they both said yes! ... Cheers! It's all good so it will be totally Danish... yeah, ok, to hell with that ... 'tallica is only 1/4 Danish (the miss says it's only 1/8 and claims whining that dad is only half Danish,- haha, stupid woman...!), but let us celebrate our Danishness wherever and whenever we can, especially when we don't do that too often... So with other words, here's a summary: I'm happy to announce that Volbeat and Mnemic will do the Metallica-show as Danish as possible in Århus the 13th of July. Hei from Lars”

Source: Official Metallica Site | www. Metallica.com