As stated before, I imagine that we'll see the whole gamut of controller options, and David Brabens' comments certainly seem to support something along those lines.
I have a request for those of us using HOTAS setups though, to please have the game recognise the more common ones natively, and support function assignment through the in-game options menu. Mostly this is because it's MUCH easier to assign functions in game, rather than having to alt-tab to the controller software and fiddle with profiles there all the time. And not all HOTAS profile software is created equal - Saiteks' is evidently very good, as is Thrustmasters. The Logitech one, not so much......
Another reason I'm asking this specifically though, is I have a Logitech G940, and for some unfathomable reason, the driver is designed such that it's reported to Windows as 3 separate controllers, not just one integrated one. Consequently there are a whole lot of games where you can only use the stick (controller no 1), but not the throttle & peddles (controllers 2 & 3). There's a 3rd party work around for this called PPJoy (creates a new, virtual device instead of the 3 logitech defaults), but it's a pain in my ass to get it working properly. The way DCS manages controllers & function assignment works quite well, in my experience, and recognises most, if not all, the common HOTAS sets out of the box.