A lot of more sound effects that doesn't come from music bricks (ambient sounds, footstep sounds with different types for each material brick, default engine sounds cycle for vehicles) More avatar customization options, better physics, more environment options and more player animations (walk when pressing C and swimming for example) A complete tutorial (there is parts lacking from the tutorial back in interiors and terrains)
Bug fixes
Oh come on we have those like, 2-4 times per month and they are nothing special