Death Knights are in the unique position of being open to every race as long as you get to the certain leveling. This means you will have a lot of options for trying to pick the best racial bonuses for your new DK. Let's go over the options listed as followings:
Horde:
Orc: Blood Fury would be handy for DPS, not so good for tanks; Hardiness, on the other hand, would be nice, if not essential, for a tank to have; and Axe Specialization is helpful, given that axes will be available for death knight's to use as rune weapons
Tauren: War Stomp is great for PvP. Endurance is probably the best overall tanking racial out of all the races. And Nature Resistance will probably be handy somewhere, though it's not a huge deal.
Troll: Berserking is a useful, if occasional, boost.
Forsaken: I still contend that Will of the Forsaken is overpowered. May certainly come in handy while tanking, and of course in PvP. Shadow Resistance, like Nature Resistance, is a marginal benefit.
Blood Elf: It remains to be seen how the Mana Tap/Arcane Torrent system will work with death knight's Runic Power, but this has the potential to be very useful. Magic Resistance is, numerically, stronger than any other race's inherent resistance - you wind up with 25 points of resistance overall.
Alliance:
Dwarf: Stoneform can be very useful to remove certain debuffs while tanking. If Frost ends up being a major damage type in Wrath, Frost Resistance might be the best inherent resistance to have, though this is still a small amount.
Gnome: Escape Artist is lovely for PvP, and the Arcane Resistance.
Human: Diplomacy is very pleasant to have in late-game PvE for faction grinding. Sword and Mace Specialization will both be usable to the Death Knight.
Night Elf: Quickness is good for a tank and the nature Resistance.
Draenei: Gift of the Naaru is especially useful given that the DK is not a healing class. As far as I know, it has not yet been revealed whether Draenei death knight will get Heroic Presence or Inspiring Presence, but either would be helpful, and the Shadow Resistance.
So in the long run, you can take the various racial bonuses as a reference to help with you choice to make your death knight, which will depend on your preference and options.

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