EnSight 10 Plotting Style Manager allows you to reuse settings for plots.
EnSight 10 will resize elements of your plot when auto-layout is enabled, so that titles and other parts do not overlap each other and make your plot look bad.
Volume Rending in EnSight 10 is faster and requires much less video memory, making it much more practical.
EnSight 10 offers new part creation options.
EnSight 10 lets you color parts in several new ways including drag and drop from the variables list.
The new part list in EnSight 10 is much more powerful and flexible, and shows more parts.