One clue is that Tivus launched a new website last week and the Philly Marriott is on there? I don't suppose Tivus would add them to their new website if there was no more significance.
The test system that was there when jwez and waggett visited. It was also there when I visited and it is still there.
A few "backend" updates (including the switches) have been updated for the final install which is crucial because the entire system would've probably been overloaded if they pushed the final version without these updates.
We are just waiting for the final "endware" update (which includes the new interface). This all had to happen in phases and on the hotel's timeline (for the most part).