No one except Steve Jobs and Jonathan Ive and perhaps some Apple engineers know this. Maybe there's a way to shoehorn a dedicated video processor with its own memory into MBA v2, but it would be all speculation at this point.
I wouldn't expect it before the MacBook gets them, although it's certainly possible (very improbable though, both from a size and from a heat standpoint).
i really want one of these for linux. once they can shove dedicated graphics in this thing, i'm sold. [dueling banjos]apple sure does make some of the purtiest electronics i tell you what.[/dueling banjos]