I'm also a big fan of the more modern dwarves - or, rather, not a fan at all of the 'small vikings' thing we've had going these last few editions. 7th and 8th ed has seen a lot of armies grow and mature into cultures in their own right, and move away from the pattern of adding a fantasy element to a historical stereotype; thus the Empire now look more like fantasy humans, rather than just 'renescance germany with added magic'. Sure, GW still get a lot of their inspiration from history, because that's the root of most, if not all of the fantasy genre, but they seem to be taking steps to bring their own ideas to the table. Thus, it doesn't matter if it looks more 'celtic' or more 'norse' because it's neither - it's 'Dwarven'. I'm looking forward to seeing what they're going to do with the rest of our 'fantasy reboot'.
Far as the minis we've already seen, I'm loving the slayer. They've always been our most characterful models, so why not have this one with a bit of dynamic in him? I agree with what most people on here are saying about the hammerers though - neck down, they look awesome; the heads could maybe be fixed with face masks or inventive painting. The Belegar model is awesome, though I might have to do some work on his little button nose...