Congrats Krispy and welcome to the AppRadio 2 family! In regards to your original post, VBLUE42 is a veteran member of this forum among others and many have benefited from his help (myself included). In order to try to help you a bit more about your current situation, I will try to walk you through the steps necessary to get your iPhone 5 working with your AR2.
The minimum absolute requirements to get the two devices to work together requires the following:
1) AR2 (running firmware v8.30)
2) iPhone 5
3) HDMI cable
4) Lightning Digital AV Adapter
So long as you have these things, you can connect the iPhone 5 to AR2 via bluetooth and HDMI. With this setup, you will get AppRadio Mode and be able to do most of what the radio is intended for with the exceptions stated by VBLUE42 (no charging of iPhone and no native iPod app on the head unit). These two things can be easily fixed by using a USB cigarette lighter adapter with the lightning cable and to get music, there are multiple apps to handle that, ex: CarMediaPlayer, EC Touch, etc.
If you are running v8.30 already then the iPhone 5 should work right away. If you are running on an older firmware version (8.15 or 8.17), you can head over to this page to check which version your AppRadio is running.
http://www.appradioworld.com/2013/06/how-to-check-your-appradio-2-firmware.html
If you need to update to v8.30, follow the directions on the Pioneer site. I strongly suggest you read through it a few times before attempting to update. Updating will require 2 extra items:
1) USB 2.0 flash drive (FAT32 format - this needs to be formatted by a Windows computer, NOT MAC!!! Mac formatting will add extra hidden files that the radio cannot read from. There are 2 files required for the update, load only 1 at a time onto the drive in the order the instructions state. Or you can use 2 drives; just make sure you know which one has which file if you don't have the laptop in the car with you when installing.)
2) Pioneer Cable** This part is tricky. What VBLUE42 told you is true, based on the Pioneer manuals and descriptions for updates via USB, they state and show the picture for the original cable provided with a new AR2 purchase, CD-IU201N. To be safe, this should be the cable you purchase. But... I don't see why the CD-IH202 wouldn't work considering it uses the same plug-in interface as the other cable and is a simple USB female end. Since I don't own the CD-IH202 cable and did my update with the CD-IU201N cable, I would recommend the CD-IU201N, so that you won't have any problems. The CD-IU201N cable currently costs $60 vs CD-IH202 for $50 on the Pioneer website (may be cheaper elsewhere). For the difference in pricing, the CD-IU201N adds the advantage of being able to use older iOS devices with 30-pins with the AR2. And again, if you have this cable, you will not need the cigarette lighter adapter and you can run the lightning USB cable from this one and draw power directly from the HU.
firmware v8.30 + instructions
http://www.pioneerelectronics.com/PUSA/Car/UnAssigned-Content/Firmware%20Updates/AppRadio%202%20Firmware%20Update%20v8.30
CD-IU201N - http://www.pioneerelectronics.com/PUSA/Car/Accessories/Smartphone-and-iPod-Cables/CD-IU201N
CD-IH202 - http://www.pioneerelectronics.com/PUSA/Car/Accessories/Smartphone-and-iPod-Cables/CD-IH202
Once installed with the proper firmware, the iPhone 5 should work "seamlessly" with AR2. In case you're interested, the best option currently to maximize iPhone 5 usage is to jailbreak the iPhone and install AppRadio Extensions (developed by Mike DeCaro after lots of hard work, time and effort!). You can search this forum for more information on this topic if you want.
I hope this helps clear up a few things and good luck with your new project. And as always, feel free to roam this site and others like AppRadioWorld, as most of what you may want to know has already been asked and answered in great detail by some heavily seasoned pros.
-AZNMAN002