The VOIDRUNNER'S CODEX is coming! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
You can see Vic Wertz mentions to people to refresh their browser cache if they are seeing more purple than green once the production cover was released.
When they announce a new product they usually produce a mock-up cover for it, with recycled art from a previously published product before the actual cover is approved. That's all this is; if you follow the thread that Ironwolf linked they eventually mention it.