Well, to push the 200 mile barrier, they will need the 60 kWh battery. So I guess they haven't outright stated the battery size but deducing from the range, one would think that at least one LEAF model would have the large 60 kWh battery.
From reading articles however it sounds like there would still be an entry level LEAF with a 40 kWh battery as you mention.
https://electrek.co/2017/03/10/nissan-2 ... september/
https://cleantechnica.com/2017/05/03/ni ... -old-leaf/
Will be interesting to see though, I think it's worth waiting for, it is in fact only a month away...