There's been an increasing trend of previously-open-weight models going closed-source once they reach a certain size (and size is proportional to capital investment). That the latest release will be open-weight is not necessarily a given just because the previous one was.
It was literally in the announcement from Black Forest Labs:
"Open Weights version of FLUX 3 Image is launching in the coming weeks."
Okay, thank you for posting that. When I commented, the only things I saw in this thread were people saying it would be open "because the previous ones were". My point was that that was insufficient without Black Forest Labs giving a more direct answer.
What trend? BFL was always non commercial. The "only" trend would be qwen image not being apache anymore.