Hello,
There are 60-70 questions in the exam.
Informations about the BGP+MPLS exam can be found at
http://www.cisco.com/web/learning/le3/current_exams/642-691.html
You can expect simulations now in any Professional exam, it is most likely to be asked to configure something within such a simulation. So you have to be prepared to a level, where you also know about the IOS commands covered in the respective Cisco classes.
Hope this helps! Please rate all posts.
Regards, Martin