This is the 11774th most frequent French word.
sortiront
"Sortiront" means "will go out" or "will come out."
The word 'sortiront' is used in the future tense to indicate that the subject 'Ils' (they) will perform the action of going out.
Ils sortiront demain pour aller au parc.
They will go out tomorrow to go to the park.
In this context, 'sortiront' is used to mean 'will be released' or 'will become available', referring to the books entering into circulation.
Les livres sortiront en librairie la semaine prochaine.
The books will be released in bookstores next week.
Here, 'sortiront' is used to denote the act of leaving a place, conditional upon the situation described.