Some questions from a Unity veteran but total Unreal newbie

Development World Creation
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2
  1. level streaming is possible in the UE4 (take a look at the documentation: https://docs.unrealengine/latest/INT/Search/index.html?q=level+streaming&x=0&y=0)
  2. Speedtree will be integrated into the UE4: https://forums.unrealengine/showthread.php?1173-Official-word-on-SpeedTree-for-UE4-subscribers&highlight=speedtree