I think we may have to wait a little while for this information. I first got a call from HP in response to my request for samples and real-world cost-per-print information, but my inquiry was referred to a specialist. Then I got that call and was told that all pricing information would be given to me by my local resellers. Then I talked with my reseller today and they said they would have to research the cost-per-print.
Combined with HP's "Smart Printing Services" where your cost is reviewed and adjusted every year without a contractual cap, I fear Edgeline cost per print could still be somewhat volatile at this point.
Hopefully we will find out more in the weeks to come as ink might offer some interesting new possibilities / finish qualities / etc... if it's cost effective to run this machine. Will post if I find out more... unless others are able to get some information from your local reps first and beat me to the punch, which would also be much appreciated.