Those concepts are looking very very cool. I'm not sure what I would do with them since none of my friends play KoW, but I will be extremely tempted to get an army! Hopefully with the Kickstarter giving them a boost in funds, they'll appear sooner rather than later.
If models get sculpted to look like those concepts then I will definitely be into getting them. And that's coming from someone who loves GWs style!
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Neither the army of light or darkness really does anything for me, but the "nature" army, if done right, could be really, really cool!
I personally am hoping for something a tad less wood elf/fairies and a little more smelly/hairy Celt barbarians. Think "Slaine the Horned God" with a strong druidic influence. I guess basically I want Celtos Gaels in plastic Wasn't a huge fan of i-Kore's sculpting on that particular range, but the same genre done by Mantic would be ace.
Some supernatural or demi-human units like satyrs, centaurs, and dryads would be a cool addition.