While Trine 2 already has a publisher here in the United States, until recently it didn't have one in Europe. That has recently changed as Focus Home Interactive is picking up the title. European fans can enjoy some of that physics-based side scrolling goodness starting some time in the 4th Quarter of 2011 on PC and Mac.
If you have never played the original Trine, you can get it on Steam. Try it, and then get excited for Trine 2. Because that is what you should be doing. And I'm glad Europe is getting the game too, it's always a shame when one region does not get a game that another does.