On the sign, the closing date of The New Frontier is 16 July 2007.
Inside, the closing has already begun. The old time cowboy/machines by the front doors have been removed. It's sort of ridiculous that they didn't leave them standing there to close out the place.
I estimate that about 5% of the machines are turned off. Some machines have been removed entirely. In the area somewhat near the main cashier, is a location where the machines have been removed from the structure on which they sit, and the slot table now remains oddly vacant.
Sigma Derby is still going, but who knows if it will ride it out to the very end.
The gift shop is rather empty. There are no more Frontier branded glasses of any sort. T-shirts are gone. The gift shop is not too much more than a soda and cigarette machine being tended by a human cashier.
When The Stardust closed, it was handled in a high class manner. Doing so made sense as the same company that ran The Stardust, was running the follow-up project (Echelon).
The Frontier is different. The place is sold. There is no sense of any sort of continuity. So I guess that they will close it in a similar way to how they ran it in recent years.