I used to be an APAP-3 guy but I've been using the new firmware since June and I can tell you that the APAP-2 is just perfect for me. No more pressure cutouts of fluttering. It is absolutely comfortable for me. I believe that only APAP-2 has been updated in this release, at least that is all I was asked to test.
The Nitelog software connects via Bluetooth and I've used it with KitKat and Lollipop phones and it works fine. I'm personally not an obsessive numbers guy so I only use the software to check on my AHI from time to time.
You can download the firmware from HDM and the Software on the Play Store.
A very worthwhile improvement in my opinion.
Questions? ask away!