OpenAI is teasing a 10 a.m. PT livestream on X with almost no explanation beyond the line "Today. 10am PT." Sam Altman reposted the announcement, giving the teaser extra reach, but so far the public information is still just the company's short video and the time. That leaves readers with a familiar teaser setup: a tightly framed announcement window, a branded hint and a lot of guessing before the stream starts.