What sort of transition do you think that there should be between acts? In Diablo 2 after having completed the final quest in each act you talk to a traveler or walk through a portal and receive a cut-scene before you suddenly appear in new surroundings. This is only one possible approach. Acts could transition between one another with no distinct boundary, leaving you completely in control, or there could be a journey between acts. What do you think would be good for Diablo 3?