You can not use QTR with these new Epson large format printers and there is a good chance according to Roy that you will never be able to.
With Epson ABW as it is now you can't print out a grayscale target on any media, adjust the ink limits for that media and linearize it in a precise way. Jon, Paul Roark and all these guys have done this forever,...
Without the ability to linearize this system to YOUR printer and YOUR media, you are not even in the ball game in my opinion. ...
Being able to linearize my profiles using QTR tools was a major advance in the art for me.
One of QTR's applets ("Create ICC-RGB") allows us to make grayscale ICCs. The approach allows users to linearize the ABW workflow if one is a Windows 7 user with PS CC. However, I don't think many use the approach.
The general "Create ICC-RGB" approach, more importantly from my perspective, allows me to use an ICC workflow with variable tone B&W inksets, if they are designed to be compatible. While I prefer the QTR full rip approach, there is a workflow that allows linearization and utilizes the standard Epson driver (non-rip) printing approach. This can cover printers even if there is no rip support. I have done this with a number of printers.
QTR and other such rips, however, are more flexible and easier to profile. And most should stick with a standardized system where profiles are make available.