2. There will be some kind of introductory area (after a certain quest the main characters comment on something that happened before you start out on the beach), but I don't know if there will be any explicit tutorial stuff, or if levelling will be described. There should at least be additional tooltips (same for spell descriptions) and UI improvements.
3. note to self: buy Tornado spell book
6. Conversation AI options for your non-lead character have not been implemented yet, so for now you have to answer for both.