I just picked up the relatively newly released black Route 66 Mustang (and have to say, she's a sweet heart!) and didn't notice any change in "availability" of cars (there were a number of different liveries available at a number of dealers I looked at)
From the the update at the end of September on their FB page, showing a detailed Legends car, it looks like they are in the home stretch on bringing those to market!
(can be seen here:
https://www.facebook.com/pioneerslotcars/ )
So it looks like it is still full steam ahead at Pioneer from here!
:)