6.4 Head ???

So the new 2014 Ram trucks of 2500 and 3500 will have the option of a 6.4L Hemi.
Does anybody know anything about these heads, good, bad, in terms of performance. Any changes made to them?
Does anybody have a part # for these heads. I called a few dealers near me and they want the VIN, which I don't have any since none are on the lots.
If these heads are good, and inexpensive, I am thinking of getting a set for a 5.7.
Years ago the 6.1 heads were cheap to buy outright. Now they want a core charge as well.
Any info would be great, even some VIN's so my dealers can look them up.

Thanks
Onig