He's been great whenever I've seen him play for the US national team. Nailed on starter at 22 with already 22 caps to his name. Can see someone like Chelsea or Spurs going in for him and he'll turn into one of the best RBs in the world in a couple of seasons.
Personally, I would love to see him at the Villa, but his stock will be a bit higher after this WC. Might not be able to get him unless Emery really wants him and convinces him this summer.