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Thin client, less to download, faster loading times, helps keep min specs low
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All new physics and aerodynamics engine with much more control for aircraft developers to define aircraft surfaces/geometry to make full use of the flight dynamics.
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Fully simulated hot air balloon physics.
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Massive performance improvements, multi-threaded
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Backwards-compatible (community folder still there)
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Updated systems (electrical, pneumatic, fuel and hydraulic)
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Failure, wear and tear system
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Payload and passenger system overhaul
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Deeper and wider avionics packages
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Enhanced tree diversity
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Improved cliffs
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3rd tessellated ground materials
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Improved ground details - Screenshot
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Full seasons
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Aurora borealis, tornados, improved storms
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Animals herds and migration
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World live ship traffic
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Accurate live traffic + more real liveries
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Improved vehicle traffic
The soft body of the balloon was pretty interesting.