Hey @KristerNevin, That's awesome, I have a Play GTX too and I love it! Firmware updates are accomplished through a free desktop application - VoiceSupport 2. Connect the Play GTX to a computer via USB, and VoiceSupport should detect the pedal and let you know if there's an update available or not. The latest firmware for Play GTX is build 61 from 2015, I don't think any effects were added but certainly some welcome bug fixes. There is also a large library of Cloud presets you can download through VoiceSupport onto the pedal.
As for VoiceLiveEditor, I've used the VoiceLive 3 editor and it was great. Personally I'm never creating presets at a computer so I tend to just use the interface on the pedals themselves, but for people who really want to tweak every available parameter the desktop editor is a great option. I can vouch for the creator of those apps that he's a trustworthy guy, we collaborate from time to time. Cheers!