I hope respawning for common mobs make an appearance as well. The "dead world" syndrome some games end up suffering from is awful.

What might be cool would be to implement weak monsters repopulating certain areas. These would avoid or flee from players initially, until they grow stronger and then attack players on sight. Not sure about the time table, but it would give players the option of being either righteous for letting them live or evil for hunting down and slaughtering the weak.