They've gone quiet since the draft, which is the right thing to do. They shouldn't negotiate in public, and they probably don't even want to appear to be using Nebraska as a negotiating tactic.
Personally, I think that if Starling does come up to Nebraska this weekend, that tells me that there is at least some possibility he will remain in Nebraska. Most Nebraska fans see Starling's move to Nebraska as a transparent bluff, and I'm sure the Royals would see through it too. The only way that tactic works is if it's not entirely a bluff.
I still think it's about a 98% chance he goes to Kansas City, but I do think that if he moves up to Nebraska, if he gets settles in, starts working out with the team, and has a month to make friends on the team or around campus, familiarize himself with the culture of the program and the University - it could get interesting. This is an 18-year-old kid, and while most of us can't dream of turning down 6 million dollars, money may not be the most important thing to him, and he may be confident enough in his own abilities to think that he can get the same amount of money a few years down the road. He may think he doesn't have to choose one life or the other - he may want to have both.
Still, I think it's about a 98% chance he goes to the Royals.