Just a guess based on this quote:

"We'll show the next Maxima in New York and a couple of other things — but not concepts," Nissan North America spokesman Darryll Harrison told Inside Line"

Meaning that in addition to the redesigned Maxima they will be introducing a couple other production vehicles...Just a guess but the oldest vehicles in their fleet other than the Maxima would be the X and the Z which are both due for a redesign...NYC auto show is 2 months away and is where Nissan introduced the 2nd gen X a few years ago...