Who Snagged the First TV Interview with Bruce Jenner?

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Update: In June 2015, Caitlyn Jenner came out as a transgender woman. This content was written in February 2015 before Jenner publicly announced her full transition.

After his secret struggle, reality TV father and former Olympian Bruce Jenner is "finally happy" and transitioning into a woman. Subscribe now to read the REAL story behind his life-changing decision in PEOPLE.

Before Bruce Jenner does a reality show about transitioning into a woman, he’ll sit down for a televised interview – and he’s chosen Diane Sawyer to ask the questions.

PEOPLE has learned the former World News anchor has snagged the much-anticipated first sit-down with Jenner, who’s already prepping a reality show about his transition.

It’s unclear when the interview will take place or air, but it’s likely to serve as a walk-up to Jenner’s docuseries that will run on E! this year.

It’s been widely reported the docuseries won’t air until Keeping Up with the Kardashians finishes its season – and Jenner gives it a thumbs-up.

“It will air when he is ready to be open about his transition,” a source told PEOPLE. “But he’s acting more and more confident and seems very happy.”

Sawyer stepped down from her five-year role as World News anchor on Aug. 27, but she told viewers that she wasn’t “going far.”

She recently returned to the nightly news show to promote her story on sex trafficking that aired on Nightline and Good Morning America.