I currently have an iPhone 6S connected to a Z110BT via a CD-IU50V cable w/ a 30pin to Lightning adapter. I successfully upgraded to the 2015 maps as per the thread in Hacks/Mods. There is an additional Lightning FW update which is for iPhones with a Lightning connector. Once updated this FW will add an "iPod Settings" choice to the AV Settings tab. Link to the FW instruction Im speaking of below
http://www.pioneerelectronics.com/StaticFiles/PUSA/Files/Car-Firmware/AVIC-Z140BH_X940BT_FW-Update_v5.100_INSTRUCTIONS.pdf
My question, is this special FW update only for people using a Z