Of course they fed the entire product roadmap into GPT-4.. jk.
So obviously it's been in the works for a few years now but didn't release to capture the market in a blast. Likely they have GPT-8 already in the making.
>Continued Altman, “We’ve made a soft promise to investors that, ‘Once we build a generally intelligent system, that basically we will ask it to figure out a way to make an investment return for you.'”