What the sources confirm

Official stores list September 29. Xbox Wire's June preview says its writer played a demo after the Xbox Games Showcase, evidence of a preview build rather than general buyer access.

What is not confirmed yet

No head-start entitlement, start hour or public early-access offer was found in the captured sources.

How to use this answer

Check the exact store edition and account terms before buying for early access. A press preview or preorder reward is not a guaranteed head start.

Visual reference

Original fan-made voxel artwork for Early access
Original fan-made artwork for this independent wiki. It is not an in-game screenshot or gameplay evidence.