This seemed like the best or at least most recent thread to bump
Arriving DTW ~6am on Monday Jan 14, departing ~6 hours later on DL159 DTW-ICN. The various "what to do on a long layover in DTW" threads have interesting ideas but none that seem terribly practical for January plus being back at the airport in time for an international flight, but if I'm missing any interesting possibilities let me know!
Otherwise if anyone in the area wants to meet up for breakfast

and failing that I guess I'll look into a day rate at the Westin (I've been through DTW enough that exploring the airside time-killers for 6 hours doesn't sound too appealing

)