They are planning to terminate 20 tph at Ditmars Blvd. They currently terminate 12 tph.
They used to terminate 20 tph back in the old days, when two services terminated there, after the 1949 track changes.
The track layout at Ditmars is not the best arrangment for reversing trains in a two-track stub terminal. However, 20 tph should not tax the TA's managerial capabilities.
The biggest challenge will occur, when one of the pockets will be occupied by a disabled train. They will have to turn around trains at 3 minute intervals from a single track. Considering, that it will take about 120 seconds to berth and remove a train from the station, there will not be enough time for the T/O to change ends in the remaining 60 seconds. They had better plan on switching T/O's or they'll find themselves backed up to Queensboro Plaza.