Right now, we only know that Bethesda plan on launching Nuka World, the next big story expansion for Fallout 4, and the last planned (so far!) post launch content for it, some time in August- the exact release date is unknown for now.
August 30 would be skirting the self imposed deadline of an August release that Bethesda have planed on themselves- at that point, it’s practically a September launch, and only very technically an August launch. So basically, it seems like you have far more than a month’s worth of wait ahead of you before you can play Nuka World. Hopefully it lives up to the wait.
As usual, take this report with a grain of salt until we hear more from Bethesda in the future.