And the 200 miles is likely to be 200 marketing miles (100 to 150 real miles as driven).
It's still a few years away, so I don't know how we're going to have much insight into what it'll actually do.
The one tidbit I do have, though, is that when GM did their focus group that leaked a few months back, they were asking people to evaluate an EV with a 205 mile EPA range.
I'm thinking their target is something close to what the S60 does for range in the real world; it remains to be seen how well they hit it.
Walter