Hi,
We will not put any advertisement on the app, but we plan to develop a toolkit so forum owner has an option to put THEIR advertisement on the app when their members viewing their forum.
Thanks vbreal your nice comment. For the security part we inherit it from vbulletin existing policy, that is, if your forum is supposed to hide from a specific user, it will appear the same in the iphone app.
Again our support forum is just opened in case you want to get first hand information on it is available at
http://www.tapatalk.com/forum
We are still awaiting Apple approval for the app to appear on app store.