Okay guys. I've got some more informations for you about Venetica:
Release: December 18 (Probably Germany only or Europe. I doubt this date is worldwide)
game lenght: ~25hours
achievements: http://www.xbox360achievements.org/game/venetica/achievements/
First test of the 360 version (German): 8/10 http://www.gamepro.de/test/spiele/xbox360/rollenspiel/venetica_test/1963878/venetica_test_p4.html
Venetica also received the German Developers Award for Best German Actiongame 2009.