Related Clues:

• Awaiting scheduling, briefly
• Undecided, on a sked
• Slot-to-fill abbr
• Letters on a schedule meaning 'We'll let you know'
• 'Still open,' on a sched
• "Not sure yet," on a sched
• Schedule inits
• 'More info later': Abbr
• Unfilled schedule slot abbr
• Timetable abbr. hidden in 17- and 61-Across and 11- and 29-Down
• "More info later": Abbr
• Unfilled as yet, for short
• Slot's space holder
• Letters on an unfinished sched
• 'Check this time slot later'