Chad,
The new wings dont do anything to prevent the tip stall. The new wings had some things changed in the building process to make them stronger.

Guys,
you want a plane that has some tip stall tendency. Without it you wouldnt have an aerobatic plane. You just dont want it to happen to early anytime you pull elevator.

If you take two of these planes and line them up one weighing 13 pounds the other weighing 11. The one that weighs less will stall out a slower speed than the one that weighs more in a power off stall.

In addition, The tip stall can happen at ANY speed. (Fast moving plane or slow) When the max angle of attack is exceeded for that wing its going to stall out. The plane can be going 100 MPH at the time. Its called an accelerated stall.
Weight will also effect when this happens. Lighter planes will be able to handle higher AoA than heavier ones with the same wing.

Thats why stall speeds are adjusted every flight in full size planes for weight changes, altitude of the field the plane is landing or taking off at and Temperature.

The wing is the wing. It doesnt change from flight to flight. Other factors effect how that given wing will fly. mainly weight in our models.