First off: autorotations are still impossible in the Beta (you lose all lift in a matter of seconds, even with a proper glideslope).
The MH-9 Hummingbird is now way too unresponsive, especially to roll input (even slower than the Ka-60). Responsiveness seems to be generally lower on the roll axis than on the pitch axis (especially visible with moving swashplates).
Yaw rate feels off as well: it now seems to be faster on the CH-49 than on the MH-9.
Wheeled helicopters still cannot taxi. I noticed some even have a moving swash plate, but cannot use that to taxi.
Suspensions as well are non-working: their position only depends on wheel contact, not on actual forces.
Damage is also handled strangely: it is now sometimes possible to literally crash into the ground without exploding/hurting the pilot.
Rotor should get damaged much quicker when smashing it against the ground/trees/houses/etc. This type of "crash" should not damage the engine the way it does now.
Rotorless helicopters also have some sort of self-righting behavior: if they are lying on the side, they will eventually get back on their skids/wheels.
Interaction with water is also wrong: crashing at high speeds into it will only stop the helicopter, but if the rotor doesn't collide, you'll take no damage.
Helicopters (the Ka-60, at least) sink very, very slowly (feels more like quicksand, but slower).