In another set of unofficial spoilers, it looks like we have the third captain of the "Captain Cycle" from Dark Ascension:
If you include Stromkirk Captain and Everwolf, Diregraf Captain looks to be the third captain in a Captain Cycle of cards. I like it. It's a zombie, it's a lord, and it speeds up the clock on your opponent considerably. And just like 3/4 of the cards in Dark Ascension, it combos with Gravecrawler.
Zombies love Diregraf Captain. Put him in a zombie deck.
More specifically, Diregraf Captain wants to be pair up with zombies that die repeatedly. This criteria is met by three zombies in particular: