They are going to be moving the worked area around. They have not started working on the front yet, but when they do they will be putting a skrim up so that it still looks good in pictures from a ways off.
All train stops are working. From the rear, facing the station, the left side is open and you can access the train from there.
To get up to the train, simply enter through the right (if entering the park) entry way and proceed to the stairs.
I couldn't get a picture but I took a peek on the interior lower level of the station and it is COMPLETELY gutted, down to the bare concrete walls. The entire floor is ripped up and there is NOTHING in there, so it looks as if they are doing a COMPLETE rebuild of the interior.
Also if you notice they have ripped up the street and sidewalk in the worked on area of Main St in the back of the station. I dont know what they are doing but it seems that it's MUCH more than your standard clean-up and repaint job. They are doing some extreme cosmetic work and may be substantially changing the look of the back loop of Main St.