I assume you guys are referring to the new IOS version 4 of Waze?
Apart from the issue that you have mentioned with the bar taking up a lot of space when Waze is landscape mode, I'm very interested to know if Waze version 4 is actually working for you on your Pioneer?
I have a AVIC-f70DAB (Australian version of the AVIC-8100NEX) but have so far been unable to even get Waze v4 displayed on my Pioneer whereas v3 worked fine (apart from the occasional reboot of my iPhone 6).
Did you do anything specific to get Waze 4 connected to your radio?
Would greatly appreciate your feedback.