Expect the first weeks to be chaotic. Lots of people everywhere. Most people will have a rough idea where to level. A lot of those people will have the same ideas. The obvious camps and level spots will be packed. The world is not that large and there are not many areas where almost naked low level chars can hunt.
In Classic on live it was not unusual that a full group killed 2 mobs every 7 minutes. The 2 treants in Southern Karana for example. Aviak Town was surrounded by 6 to 8 groups. - On a server with around 2000 players during prime time. LGuk had around 100 people in it. - 1 group camping 1 room. Hoping to catch a roamer from time to time. The comparatively slow pace of a full server might be enough to make people give up, even when the chaotic starting days are over.
I expect a lot of drama. I expect that a lot of people will decide to log off again instead of enduring it. It will be helpful to have a high tolerance for frustration and a masochistic streak.
I don't know if there will be really the 4000 to 5000 players as expected by some of the posters here, but no matter how many players there will be, the zones are not created to handle that. What is your favorite newbie zone? Imagine to hunt there together with 200 other people.
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