I doubt "speed runs" will exist, at least with the major focus they had with it in 1.0. The reason why we had speedruns was because of the severs limit to handle instances. If one was allowed to be in a dungeon as long as they wished then it would clog up anyone else from entering. So in order to stop this they had to make speed runs a means of getting a chance at better items in order to encourage those spamming the dungeon to get said content done asap so that others would not have to wait if said dungeon had a lot of people wanting to enter it.

Hopefully more emphasis will be placed on exploration, tactics and such, rather then bumrushing content to receive a better reward. Though alpha should be able to give us a good idea well those who can talk about it with one another a good idea as to what dungeons will offer though honestly if SE does want to entice people into 2.0 it would be good to explain how they plan on doing their dungeon concept in 2.0.