It contains major improvements for KDE (more platforms; more Free Qt modules; inclusion of Qt Project; many small details). It also comes with a change to the licensing rules of Qt, as described in the news article linked above and as discussed earlier on this blog.
The new agreement follows nearly two years of negotiations, with intensive scrutiny by KDE e.V. members and a helpful review by our lawyer, Till Jaeger.
I am very happy that we have finally concluded this.