So you spend the time and create a good dungeon, publish it for the world to review and get some constructive feedback.

Based on this feedback you modify the dungeon, and want to upload as v2.0 replacing the existing dungeon.

How do you do this?

You can upload a new version with a slightly different name, but there is no mechanism (that I can see) to update or delete an existing community dungeon that you have published.

You have three sections in the online menu dungeon, Home Dungeon, published Dungeon, Community dungeon.

Go to Published dungeon and you can delete it.

But what about the ratings your older versions have gotten?
Are they transferred to the newer version or are they simply lost?

I would say they are lost as there isn't a system in place to 'revise' a map to a new version. If it's a good map then a following will grow for it again... particularly since you can advertise a new revision on here.

It is something that could maybe be put in with a following patch.

Also...the changes you make might not be as popular as you think, the older one might be more preferred.

True, but some changes are only cosmetic, like adding a few squares to the end of the ez so people don't have to zoom out to position their players.
I wouldn't call that a significant change.

Touche!