That quote tells us absolutely nothing about AOM2. All it says is that both "going back and revisiting the medieval days or moving forward into mechanized warfare" are possibilites. It doesn't say they're the ONLY possibilities. Hell, the interviewee might even have assumed the question was about the Age of Empires series, not all Age games in general.
Thoroughly inconclusive.
EDIT: I just read the whole paragraph that you failed to print. It seems that the paragraph you quoted was about Age of Empires IV, which makes sense, but again - at no point does he say AOE4 will be the next game they make. Just that it will be a game "in the future".
Take my love, take my land, take me where I cannot stand.
I don't care, I'm still free, you can't take the sky from me.
Take me out to the black, tell them I ain't comin' back.
Burn the land and boil the sea, you can't take the sky from me.
There's no place I can be, since I found Serenity.
But you can't take the sky from me...[This message has been edited by DragonQ (edited 10-29-2007 @ 07:14 AM).]