Right now you see "population" for how many people are in a dungeon.

I'd rather see something like "Joinable parties", or a list of parties and depths/levels. Maybe even map on the gate map which level the open parties are on so I can select one (taking into account what the clockworks show as their upcoming levels).

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Thinking ahead to "release", with many hundreds online at a time:

If there are 800 people playing, and 400 are playing out of the town you are playing out of, then that's about 100 per gate you can access, or about 12 per floor you can access, so you expect most levels to be occupied.

So yea, being able to select where you want to join/start can be a very useful feature.

... So why not start an expedition at someplace other than the top?