It's pretty much inconceivable that he'd have a "standard options package"

He would have been courted, offered a substantial slice of equity, and his contribution and membership of the leadership team (he's the CTO!) would have significantly contributed to the valuation.

He'd have made out huge-time.

Liquidity event clause would be normal here and he'll be vested all in, especially as he's not a regular employee. As a C-level they'll be handcuffs on the FB stock part for sure as well.

He could have negotiated something better. But so would Oculus.

Wouldn't he just have to wait until they vest then? Or does the situation change post-acquisition?