But why 'unveil' something that is not changed?
Nissan has indicated they will match or beat Chevy's Bolt, which is due by end on 2016. So it is plausible that they will do a mid-year update on the current Leaf that provides a range increase. The article didn't say what size the new battery was, just that it will have more range than the predecessor's 30kwh battery. In theory, they could boost range by putting in more battery. And I just recently saw a thread here where someone found enough room under the trunk to mount a spare tire. If there is that much spare room under there, I would think they could load in more battery.
I'm starting to think that they will boost the current model's range to compete with the Bolt before Gen 2 gets here. At 155 mile range, that starts to be viable for my commute. It won't do the round-trip, but will cover one way with enough spare to get to a relatives place as a last resort if the workplace charging doesn't work for some reason.
Hopefully they will come through on that.