official Wrath of the Lich King site is getting fleshed out with some actual information. Today, they added a page about the walrus-inspired Tuskarr, a new neutral race in Northrend. The Tuskarr are nomadic and peaceful, with tribal affiliations inscribed on their tusks. Despite their pacifistic nature, they are frequently attacked by taunka and those pesky murlocs. They are excellent fishers, and catch whales, giant squid, and "unnamed leviathans."
Although the info box at the right says "both" under "Horde/Alliance," the body of the text says "with the Horde's recent arrival they have found a new ally in the ongoing struggle against the hostile forces of Northrend." Not quite sure how to interpret that. Nethaera clarifies by calling them neutral in this forum post. Their faction name is "The Kalu'ak" (what is it with Blizz and apostrophes?), and their main settlement is called Kaskalka, in the Borean Tundra, with outposts at Kamagua in the Howling Fjord and Moa'ki Harbor in Dragonblight. Aside from a few bits of art and screenshots, that's all the new page contains; you can check it out here. More information on the Tuskarr is also available at Wowwiki.