Q: If a group of people enter an instanced dungeon, how does a new player join that group or enter their dungeon?

A: Basically the group can invite that player into their party and when the player enters the instance they will automatically be in the same instance as that party.

Q: What sort of information is the map going to display?

A: The minimap will show various points of interest such as towns and major cities. You will also be able to see members of your gro0up and if they are out of range, you'll get a directional arrow so you can easily find them.

The World Map - You can see the entire world at once, half the world or zoom into particular zones which will show areas that you've already discovered. You'll also be able to place a rally point on the zone map which group members will see..this will be used for navigational purposes.