So far to date, the following is what information we have about the Death Knight Hero class from Blizzard forum posts (BOLD text is player questions):

There are a lot of details about Death Knights that are going to be worked out in time. It seems unlikely that the first thing you are going to want to do with your Death Knight is sell off all of their gear, though like any sort of character progression, you're going to eventually replace it as you progress. What sort of monetary value the starting gear will have if it has one, will be decided further down the road. Let's try to not put the cart before the horse just yet. :)

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