I was surprised also. I figure that Rutgers was chosen because of the immaculate turf program, which is responsible for the 2 soccer practice fields and 2 football practice fields which are all amazing. The sod looks very think to last too long though, so it will probably be taken up after the World Cup.
perhaps also, this is being prepped as a backup location for Metlife? Should they not be able to host games there for any reason. RU stadium field is large enough in dimensions to meet FIFA regulations