This was mentioned on ESO Live during the ask us anything segment for July 8th
I had the thought that we would use wayshrines but as they quickly speed past the comment, it seems as though the playing with friends in One Tamriel is coming about more like continents (phased).
Assuming there won't be waiting at the docks and just means to travel, my initial thought is this...
In order to play with others, do you have to be there already or can you just travel to a friend or guild mate in addition to group members?
-PC (PTS)/Xbox One: NewBlacksmurf
~<{[50]}>~ looks better than *501