I found some images in this article: http://chi.streetsbl...boarding-pilot/
That shows the crosswalk, which I haven't seen yet, as I tend to exit the station on the other side (Adams or Jackson). What a great idea. I always hated walking through the crowds of smokers to get to the crosswalk at Jackson and Canal.
Anyway, the article shows the new, red lane that is designated for buses and those with disabilities. From what I'm reading in the article, if you have a disability, you will be allowed to have your cab drop you off at that location. That puts you by the Canal Street entrance, which is where the central elevators to the concourses are located. The risk is that private vehicles are using the curb lane, which means you have to negotiate crossing through that traffic if the cab doesn't drop you off near the crosswalk. I wish I could find a better photo.
If you choose not to use that area, you will be dropped off at the cab stand, which is on the other side of the street. You could use the special crosswalk to go to the entrance with the elevators. Or, you could walk into the Great Hall. Unfortunately, when you enter the Great Hall, you'll have to walk down a couple flights of marble stairs to get to the level with the concourses. I'm not sure if they're planning to install an elevator anywhere within the Great Hall.
Here's a map that shows both buildings and the connecting hall. Canal Street is the narrow, white rectangle that runs vertically along the center of the map, just left of Metra Ticketing. You can sort of tell you're walking under it because the hallway has a pretty distinct slope to it when you walk from the Great Hall to the Concourses. There are ramps on either side of the main hallway as well.