I just finished the Beta on a couple different characters. I don't think there was enough play time to really experience it, but of course they don't want to give too much away before release.
Definitely going to play it though.
'11 BMW E92 ///M3 - ZCP and DCT
'13 Toyota Tundra - 4x4 Platinum CrewMax, 5.7l iForce V8