Is Oprah Winfrey coming out for US presidency come 2020?

Back in March, billionaire media mogul Oprah Winfrey sparked rumors she was considering a run for the Presidency of the United States after realizing you don't need prior experience. Back then she told Bloomberg;

“I actually never thought that that was — I never considered the question even a possibility. I thought, ‘Oh gee, I don’t have the experience, I don’t know enough. And now I’m thinking, ‘Oh. Oh.’”
Last week, Oprah restarted the rumors by re-Tweeting an article calling her the Democratic Party's best hope for 2020.