The site, here, suggests that a date for an announcement is expected between the 24th and the 26th of April, and a manager for the fab has already been decided.
There's speculation that the JV will be 47% owned by ST Micro, 43 per cent by Intel and 10 per cent by other investors.
You'd think that Intel would have enough fab capacity. But enough is never enough for the Mighty Chipzilla.