I wonder if these are changes reflecting the new operating philosophy of the Meadowlands branch, namely the use of shuttle trains from Hoboken, instead of through running from the PVL. From my understanding, the original idea of the pocket track was to layover trains during events, so they can get them to the Meadowlands more quickly. Since it seems they'll be using shorter, dedicated consists, instead of PVL trains, they don't need as long of a pocket track.
rails > roads
On second thought, let's not go to the NJ Transit Rail forum, 'tis a silly place.