Just in case anyone's interested, this game has now been released. I'm very impressed by the quality of the graphics -- obviously a lot of work has gone into it.
Unfortunately I can't say the same about the voice 'acting'.... it really is quite terrible in places. Everyone has an American accent, no matter where in the world they are from. The worst bit about the voices though is that most of the actors simply cannot pronounce foreign names. Given that everyone in the game is foreign, this doesn't work very well.
Case in point: a French character called Charleroi is called "Charles Roy" by most of the other characters. It really grates after a while.
Anyway, it's a minor niggle in the grand scheme of things. The plot is good, the graphics are great and the puzzles (whilst a little easy) are well thought out.