What's Twitter CEO Evan Williams Teasing Us About?

Twitter CEO Evan Williams is officially a tease. “Tomorrow just became a very big day,” he just tweeted from his mobile phone, adding “Sorry for the teaser — more later.”

Let’s crowdsource this one. Is Twitter about to show up in Google search results? Is Twitter about to become a subsidiary of Yahoo (YHOO) or Microsoft (MSFT)? Launch paid, corporate accounts? Or perhaps something around the race to 1 million followers between Ashton Kutcher and CNN?

Or is Evan telling us something about his personal life — perhaps a development in his wife’s pregnancy or a new house?

Update: It’s Oprah!

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