This version update includes the modified C172.acf and C172_G1000.acf that use the new nosewheel steering parameters, so you can try out the new bungee steering in default aircraft now. We’ve heard pretty positive feedback on the new handling from the pilots we’ve asked to try it so far!
The interaction of the nose wheel with the rudder and brakes now closely resembles a real C172: The nosewheel is no longer rigidly connected to the rudder, but by a spring-loaded steering bungee. This connection allows a steering angle of about 10 degrees, giving you three times the precision in steering that you had previously! But sometimes you don’t want precision, you just want to make a tight turn – in that case, you use differential braking. This will pull the plane around in a tighter turn, and with the new steering bungee, the nosewheel will follow that turn without skidding, because it can castor beyond the steered deflection.
If you don’t actually have hardware brake pedals, X-Plane will add the differential braking for you when you ask for maximum rudder (using your joystick twist axis).
For aircraft authors looking to incorporate the new parameter into their planes, there is a much more detailed description here.
Edit to add: As usual, Steam release will be delayed about 24 hours–expect it to be live sometime tomorrow.