My army in the last editions was always Necrarch themed, but for the new VC I'm branching out into more bestial territory. The passage on the Krudenwald fiend really caught my eye, and I'm hopelessly in love with the Varghulf, so I'm looking at those as the basis for a theme.
At the same time, I've been a huge fan of Wights ever since the oldest days, and the new kings with their formidable toughness, coupled with the prospect of grave guard with great weapons...
Chances are I'll do two forces, each with its own theme, but work them together so they can pool into a single army for larger games.