Wagstaffe also says that multiple Apple employees were interviewed in the case, including Steve Jobs himself. Police also searched Gizmodo editor Jason Chen's house at one point (the phone was reportedly sold to Gizmodo by a college student who found it in the bar), but that warrant was withdrawn a while back, and the seized items were returned.
It's certainly possible that police could still bring criminal charges in the case, but given that the matter seems to have blown over (it's not like iPhone 4 sales were hurt by the leaks anyway), it seems unlikely that anyone will get arrested and charged. But we'll keep a lookout for the case closing anyway -- I'm sure there will be one or two documents coming to light that will provide a better look at exactly what happened. Stay tuned.
[via Mac Rumors]