@IanM: of course that is also possible with the aquaero 5 series but works a bit different compared to the aquaero 4. For example you can adjust an rpm range where you know that the fan is able to operate. So for example that could be 35 to 100%. This range can be mapped to your regulation settings with the full range of 0 to 100%. So this means that 1% in your regulation could mean 35% as real power. Well, there are so many ways in the aquaero 5 to control something... There is also some kind of start boost option.

Connecting a slave aquaero to another slave aquaero will not be possible. The problem is that the main aquaero must manage all in- and outputs so you would always have to map a lot of stuff from one device to the next which eats a lot of memory.

@Utnorris: 1. )I don't know the technical specifications of these fans but 9 does not sound that much and should work.
2.) Yes, of course. The aquaero is a stand-alone device with its own software and operating system. No PC is required at all to use it.
3.) If it is a 10kOhm NTC it will work. Flow sensor should also work (5V VDD, open collector).
4.) The new aquasuite comes with a translation tool so you can adjust the text yourself and also add Klingon or 1337-Speak if required
5.) The aquaero uses an analog output so there should be no problems with humming noise that some other controllers with PWM have.

Delivery should start mid March. These is no exact date.