Expansion Dungeon question.

Considering that the dungeon is endless? what happens if you disconnect or you can't keep going because you have some business to take care of. Will there be like every 5 dungeons a small safe zone? where if you log back in you start of in that zone. it would be a real pain starting all over. And how does the dungeon work? Once you die, you get sent back to town ? I'd prefer being sent back to town imo.
I may have missed a few things in the announcement.

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I tried to get the info outta vroom, but he wouldn't tell, I guess they won't announce/explain it until the expansion.

However, he said that if you enter the dungeon twice in a row, you'll notice they are different......