They also get death coil but sadly "not the fear component" which is like the best part surely? Finally the article mentions they will specialise in tanking magic dealing bosses, which is neat.
Then we have World Of War's article lists some cool abilities the DK will have.
WoW Insider also have a neat article combining the above two.
This info is very exciting and although the levelling slog from 55 to 70, when the new stuff can be played, will be a pain, the Death Knight looks like it will have some cool and unique abilities.