I know the KC-135's are 707 mods. I was betting that the new tankers would be 767 mods. As fixit showed us, that's right, sounds like the KC-767A. Apparently italy and Japan had previously signed contracts.
Good choice too ... though I'd still like 4 engines.
In The Dragon's Fury Series it's 767's.
There is also a version of the 767 that performs as a modern AWACS platform. Interestingly, this also offers an upgrade to the 707 based E-3.
The Japanese operate these as well.
767 AWACS