Please post pictures and let us know how it works out!Yeah, the launch of Android Auto kind of coincides with the launch of the HTC One M9 dev edition, which is what i plan on getting. So I will be able to give you some opinions on the headunit beside Android Auto until then.
I Installed the NEX4100 this evening, along with Metra's ADBOX2 and ASWC-1 to retain steering wheel controls.
I didn't take pics yet, but one thing I WILL tell you that bothers me about this headunit, and I'm not sure if any other Pioneer headunits do this (I know my AVH4700BS did not), but upon start up there is a splash screen that tells you not to look at the screen while driving and you have to hit OK every time. I hope they patch this out, quite annoying.
I dont have the m9 yet (as it is released on April 10)
I DID try a 1tb USB hard drive, and my FLAC files work flawlessly on this headunit.
I'm very excited to never have to use my Ipod ever again!
The display is very pretty, i love the smooth surface opposed to the old matte finishes of the cheaper models. Still don't know why its not even 720p consider it IS 2015, but i digress.