I guess the Speedtree modeler isn`t onboard this time, or am I wrong?
I don’t have engine yet, but as far as I know, SpeedTree integration is not ready yet.
I actually went ahead and asked IDV about UE4 integration and if it is going to be free for indies like in UDK.
They that those question should be directed at Epic, as they do not make decision for them.
My guess on that is that SpeedTree integration in UE4 will probably come for free, along with modeler, or for smaller fee than you usually pay IDV, since you won’t get source code and SDK for SpeedTree.