Brian Morrisroe interviewed

gamona.de interviewed Brian Morrisroe, the lead dungeon artist at Blizzard. Don't let the German site scare you, the interview was done in English.

Among other things, they do discuss the so-called "lost content". Morrisroe believes that people will still run level 60 5-man instances as well as Molten Core and other level 60 raid dungeons. I doubt it.