Since Green apparently already has ideas that would be important in a sequel, it seems likely he’d do it.
If and when that happens one assumes David Gordon Green will be given the opportunity to direct it.
While nothing has been officially stated about another potential Halloween movie, it seems likely those conversations have begun following the film’s massive October opening.
The only question at that point is if he’ll take it or if he’d rather parlay the success he had here into something new.