Good Luck, hopefully it doesn't follow their past product capability promises. (SL2 took several years to resolve and get working).
I'd also be worried that they are sticking with the I2C protocols of their past bus system.
A couple of notes here:
First, my usual disclaimer...I am NOT an employee of DA and do not get paid a single penny for anything I do for them. I am a beta tester and have been since the RKE first came out.
Literally all of the employees currently at Digital Aquatics did not work there upwards of two years ago. They have all walked into the trauma of dealing with getting the SL2 fixed. One of the guys there owns at least two tanks, one of which is a 400g tank I believe, and is a hobbyist like us and truly understands what we want in a controller.
I am one of the several people who have an Archon currently and I can honestly say, it is a massive improvement to the RKE/RKL line. It is simple to program, which can be done from any web-enabled device, so no more issues with myReef and needing a Windows machine to use it.
I am not a programmer so I can honestly say, I do not really understand anything about the I2C bus, but I was told that once DA releases the firmware update for all of the current modules to make them "Archon modules" the bus communication will be different. The current RKE family of modules are compatible with Archon with no updates needed, but eventually they will be updated via firmware. This will also allow them to communicate faster and future firmware updates will not require disconnecting the modules and updating them individually. I was sent only the Archon base unit and connected it to my current PC4's and all of the other modules with no updates at all.
The Archon isn't going to change the face of aquarium control the world over, but it is definitely a huge step up from the current DA line of controller. Programming is much easier, and there are a lot of nice little improvements that we all will put to good use. One example, you can assign multiple alarms to a channel with alarm #1 taking precedence over the others. This adds a lot of possibilities. You can name Alarms, timers, standbys, and modules/channels. The base unit has 4 virtual channels built in. 0v - 10v and PWM built in. I believe people making the switch will be very happy. Archon was designed from the beginning by a hobbyist and it really shows.