As you can see in the first photo, they built a curb around the grass forming that path in the centre. That's new. I don't see why they'd do that to remove later. It's strange though because on the West side, the plant boxes are surrounded by seating. It's as if they changed plans and just decided to do a cheap curb around the existing grass. It doesn't make any sense.
The existing trees look to be 20 or 30 years old so it would be a shame to cut them down but I don't see how they can install Silva cells. Maybe at this point they wouldn't be needed. Still, keeping such a large patch of grass puts us back at square one where for so long, the square looked like shit because of this muddy front porch. I hope whatever they have planned, improves on that.
On a similar note, the main pedestrian entrance stairs into the garage was supposed to be demolished and rebuilt with the entrance facing towards City Hall. It's not only been kept but it doesn't look like they're going to refurbish it either. They've laid new paving around it.
Our best hope is that they're doing some temporary work to have NPS looking finished and clean for the PanAm Games next year then they'd resume with the remaining items. Of note, work on the walkways (decking, floor cutouts and glass sides) has not even started.