Looks like they removed the original Dawn and Day material from the trailer. The first trailer had parts from those movies in it, now it just shows Night scenes.
This was done immediately. All the theatrical prints of the trailer were sans-"Dawn" and "Day" footage but the internet version that was released at the same time had the footage, probably mistakenly. They apparantly never had the rights. "Night" is public domain but the other two aren't. I know Anchor Bay owns the home video rights but I don't know exactly who owns the rights to the footage in other cases. Anyways, can a mod change the title of this thread? The film has been known as "Land of the Dead" for a long time.