Our good friends at WoW Radio have somehow boonswaggled their way into the beta, and they're letting you all reap the rewards: Totalbiscuit and his buddies all ran Utgarde Keep, the first instance of Northrend, and you can see the results above. This is the same instance we played way back at BlizzCon of last year, and it looks about the same -- you can see the hulking Vrykul, the big flame forge with its walls that come down when you pull mobs, and later on you can check out the other boss battles, including a dual boss battle (two bosses, and both have to die, or else the one that dies first spawns a shade of himself), and Ingvar the Plunderer, who has a pretty mean AoE and some cheating help. There's also a few glimpses of other beta features, including Illidan form way at the end.
Unfortunately, they don't run the next instance, Sar Chasm, which features a boss who says things to you he doesn't actually mean (spoiler: that's a joke, watch the video). But it's awesome to get a first look at Utgarde, bugs and all (the dragons who walk through the air are pretty fun), and the WoW Radio guys are pretty entertaining the whole time.