If you mean the "new" 392 based on the 6.1 then yes, I have some news. The big difference is the crank which is a custom forged unit made for Mopar to experiment with (by some high end aftermarket crank vendor, I forget who). Anyway, the problem is that it was a custom crank and that accoding to the head guy at Mopar performance production is VERY slow to come........ and they still need more cranks at Mopar for experimental reasons. So, accordingly, when and IF the 6.4L/392ci version is signed off on and released to the public, you can bet it will be a while, especially as a crate motor, most likely a few years out or more.
