Sources close to the company have confirmed the existence of a 65 nanometre R600 core, but they couldn't confirm its R670 or R650 codename.
The sources confirmed that the 65 nanometre R600 is not just a shrunken chip, it is a redesigned core scheduled for introduction in Q3.
A new core should improve the flaws in the R600 design and our sources confimed this in the original story that you can check out here.