SCS has announced that they don't know the exact release date of ETS2 yet. They also said that it absolutely won't be this year. As reason they say: "We want to deliver good quality and don't want to rush into a release."
They understand that noone is happy to hear this. Also the partners, wich are selling the games aren't happy with this.
SCS also gave the upcoming reason: "Euro Truck Simulator 2 is a game that is very expensive to create. Because of that we are almost out of money at the moment."