On the Sequoia they may have just put the newer wheels on it to make the picture more interesting if they had in fact discontinued it when the picture was taken. But you know Weber, they always sell off the old stock while they are still advertising the new. You never know what you might find in the box. Look at the HD silvers. They show a kettle with a round handle like the Gold models used to have.
On the Ranch, I don't believe they changed the design until the mid 80's.
I have a red metal handled kettle that came with the plastic white walls. It also has the ash pan that is somewhere between the old style and new where it still twists on, but for some reason still has the little hangar thingies exactly like the ones in the pictures.