I do not know when that will open. It was still being set up on this past Monday. Security lines were still at the esplanade and at the monorail. Since you are staying at DLH, you can just take the monorail into DL. If you are headed for DCA, then you'll still have the regular security lines at the esplanade. On Monday, there were many people in line, making it look like all lines were very long, but there were some shorter lines. You have to go around people to get to the shorter lines, but they are there. The metal detectors were only on the lines on the sides. All the middle lines were going faster because they didn't have metal detectors. Just keep in mind that people gather and wait in long lines, even when there are shorter lines open. Don't follow the crowds.
Same goes for the women's restrooms. Every time I went to the restroom on Monday, there was a long going out the door, but there were several empty stalls inside each time. People follow crowds and lines and don't pay attention.