Hi Ady,
No, I wasn't told at the beginning, although everyone seemed quite relaxed (including me, and that might have been due to the fact that I was stuffed with paracetamol as I had a bad cold), and so I started with a positive mindset anyway. (I also implemented the "que sera, sera" philosophy suggested by BB!)
They told me straight after the viva that I had passed with minor corrections, then they asked me to leave, and after ten minutes they called me back and handed me the list of corrections - points that I had clarified during the viva had been ticked off, so I won't need to change them.
My supervisor asked if I wanted him to be present, but I politely declined!
Do you know the date of your viva already?