There's already the usual speculation about new hiring in addition to recalling the unassigned pilots. Nothing concrete from the company.
There were people who had firm job offers and were awaiting a class date when the door slammed. IIRC, DL said they'd honor those job offers for a period of time but can't remember that time period. Same thing with people who had interviews scheduled.
Not sure what the head count is for either category but these two groups would likely supply the first new hiring (whenever THAT happens).