well guys I can confirm that CV1 runs ED as it should with runtime 0.8, using SteamVR. Almost.
After almost giving up trying with the new SDK I thought just for the heck of it try enabling xfire. And that's where it all worked. Basically everything worked, except for the fact that my second card was still idling, so the performance was like last time.
I don't know if I had the 'benefit' of that added frame delay. As xfire obviously isn't working properly, I'd guess LiquidVR is not being used. In any case I was too busy getting dizzy from the low framerate while testing graphics settings to notice an extra frame of delay added from using crossire.
However I think I've now had a look into what it will look like and to be honest - I'm a bit disappointed of the quality. I really expected a bit more.

It's better than the DK2 - sure, but the smaller font UI controls in the cockpit are still hard to read

Bleeding can still be seen in some heavy contrast areas. Granted - I was looking for those things, but it was just a bit too easy to find them than I hoped.
The low resolution was always my concern and if I could, I'd say it's one of the major contributor to the better visuals than the DK2. Even with its small increase.
I hate to say that concern has proved valid.
I'll still be buying one and playing it as it'll probably beat all else out there but I definitely could have gone for a mega enthusiast version with a 4K screen...
That's all in land visuals of course. The HMD blasts DK2 in all other areas naturally.