If you bought the Diablo 4 Ultimate Edition, you will have access to the Accelerated Battle Pass. However, you don’t need to use it for Season 1 and can save it for a future season.
This tweet dates back to May 11. However, it’s relevant now with Season of the Malignant releasing later today. Back then, Community Lead Adam Fletcher confirmed you don’t need to use the Accelerated Battle Pass for Season 1, so if you decided to skip the forthcoming season for any reason, the Battle Pass will still be there for a future season.