Back when I ran WFRP1, I actively discouraged people from playing Elves since I felt they were presented as being rare for the setting. That didn't stop people from wanting to play them since a starting Elf had many favorable advantages. Dwarfs and Halflings were much more common in the setting and more likely to be found wherever Humans were throughout the Empire. Nobody ever wanted to play a Halfling and I don't recall anyone ever doing so. Let's face it, Halflings were included only because they were at the time an iconic Fantasy race due to Tolkien and every other FRPG had them, but the Halfling got more disadvantages than advantages as a starting character, so there was less incentive to play one. Since I own, but never played WFRP2e, I can only assume they fixed this since there now seems to be much more love for the Halfling than was present when I ran 1e.
This new version seems to be limiting the base of adventures (for now) to the Reikland, the most progressive area of the Empire and thus containing the highest population of HIgh Elves. Elves should still be more rare than Humans as far as I'm concerned, but at least an Elf character won't be a shocking sight to the majority of the populace, like they might be in other parts of the Empire. The inclusion of Wood Elves is more of a stretch, although they have given a nice rationale for Wood Elves to be out and about rather than secluded. On the other hand, since Dwarfs were already commonly found throughout the Empire, it seems unnecessary to specify a specific Karak, a newly created one at that, as the source for Dwarven characters.
I still feel that the game worked best when it was Human-centric, something this version seems less suited for. In the past, when my gaming groups were larger, it was basically a party of Humans with a single Elf and maybe one or two Dwarfs. A lone Elf and Dwarf working together was easier to rationalize. In essence, each was joining a band (and cause) of Human adventurers and had to put aside their ancestral differences. There was still banter between them, but enough humans in the group to separate them if and when necessary. In a 3 or 4 person game of nWFRP, it wouldn't be surprising to see no human character at all. It will be interesting to see if FFG provides support to rationalize why groups of Elves and Dwarves would be out adventuring together.