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Menu, map selection, new weapon, armour spawn rules, new attachments, new vehicle, weapon performance, map changes (esp Miramar) etc
It handles very differently - much improved.
Also although I can't see anything in the patch notes - it LOOKS different. Graphics seem fancier. Shadows and textures in particular. I didn't change my settings so I'm sure they've tweaked something but can't place it. It's a 10gb update so can't just be a new weapon and some map tweaks.
On the subject of he new weapon... SLR + 6x scope + suppressor = unstoppable wonder gun.
pubg update is pretty fancy...