I just talked to my best friend who is in DHS for the second time this week with his family. He's ridden ToT 3 times and had some comments on the projection effect - although he's still not sure if he's experienced the new drop profile. My response was, "You'd know."
He doesn't see the world through rose-colored bifocals, and he still said the projection effect looked "really good". He said he knew what it was as soon as it was within eye-shot, and he could tell it was an image of their specific car, mirrored. It was that clear.
He said it appeared to be projected directly onto the bi-parting glass doors, and that it was actually a nice dissolve from the people to empty elevator to the white line (which always creeps him out). Whether there was a new material applied to the glass doors or not - he wasn't sure. But again, he said it actually looks good, which is contradictory to some of the reports on here.
His personal opinion was that the black star-curtains were probably to help block out ambient light in order to help the new projection effect...but he didn't object to the idea of there being construction behind them, but he said they also served a good purpose by helping to black-out the corridor.
Overall he gives the enhancements an A+, beginning with the black-outs in the boiler room. He's going to check it out a few more times tonight because he's there as part of the IBM Convention - and they've rented DHS tonight for a party.