The new security area is OPEN and it is ALL the way down at the other end of the terminal from where it was (and the UA counters). If you have your boarding pass, go towards the Delta counters (or any Skyteam carrier) and you'll be much closer to the lines than if you started with UA. I think the area opened on Saturday since an IAD engineer was chatting with a TSO about how they like the new space.

The premium line is right up the middle/center of the new corrals. At least they moved that and didn't use this as an excuse to eliminate it *whew*.

That said, this evening when I left the airport around 4:30 or 5:00, the line for security came out of the corral and stretched ALL the way back to the UA counters, around the escalator area and back down the front hallway. It looks worse now because they don't have lines or corrals for those folks in those areas, so they are loosely formed lines. I'm not sure if that's the same wait as previous or an even worse one.

The C shuttle is in the same place, but it looks like the A shuttle got moved down near the D shuttle area. If you come through security, it's a bit of a hike to the C gates (why didn't they move those - at least to the A doors?). When you get off the C bus though, if you turn right you can exit into the ticketing area and head straight for the escalator downstairs for a quick(er) exit.