I dont think you need a new process to call it the next generation.
Anandtech and other websites rate 48xx to 58xx and 58xx to 68xx as "evolution"
"As Cypress is a direct evolution of the RV770 design, before we talk about what’s new with Cypress we are "
http://www.anandtech.com/show/2841/4
"Barts: The Next Evolution of Cypress"
http://www.anandtech.com/show/3987/a...range-market/2
I agree with Anandtech they are evolutions of the same thing then again Nehalem is a evolution of C2D "Its has common pin work" and Sandy bridge also has its ground's on Nehalem.
EDIT: Also when people say that that Nehalem is not a next generation in respect to C2D but only a evolution it boils my blood. Most people in Intel take the Tick-Rock very very seriously and if some one were to tell them that their Nehalem is not much more than a evolution on Penryn they would flip.