As stated by Luke Smith (Franchise Director) on Twitter, New Light and Shadowkeep will need more time cook and are being pushed back a couple weeks.
Shadowkeep would benefit from a little more time on the workbench, so we're going to take it.
Shadowkeep & New Light will launch on 10/1/19, more details here: https://t.co/sHG9r28oGI
— Luke Smith (@thislukesmith) August 1, 2019
This follows up the rumors that have sparked today as reported here.
Next week as partr of the announcement, Luke Smith himself will talk about the state of the game and how theyve learned in the past 6 months of the game and excplaining the reasoning behind many changes that are coming to the game.