The launch of a new video streaming subscription was a keystone of AT & T's $ 85 billion deal for Time Warner, CNN's parent company.
That will change on Tuesday afternoon as AT&T gives a long-awaited presentation to key investors at the famed Warner Bros. studio party in Burbank, California.
The iconic Warner Bros. water tower has been rewritten with an HBO Max logo for the occasion.
Stephenson said that Tuesday's preview event is a culmination of more than a year's worth of WarnerMedia re-structuring and rethinking.
"You will see the result of what many people said could not be done when we made the Time Warner deal, and that is to break down the three silos in Time Warner," he said.
The media company previously had three divisions – HBO, Warner Bros and Turner – with relatively little synergy between them.
Veteran AT&T executive John Stankey became WarnerMedia CEO when the deal came into effect and dismantled some of the walls that had been built up over the years. Depending on who you ask internally, the process has been painful or helpful, disruptive or necessary.
"By bringing these three companies together, we're creating something really powerful that couldn't have been done otherwise," Stephenson said. "The idea that you can set up a product, HBO Max, that requires in-depth integration of HBO, Warner Bros and Turner, not to mention Otter Media, which is also a big part of this – man, a lot of people said that could not be done. This is exciting. "
The company's stated goal is to register 50 million subscribers by 2025, five years after launching the service.
AT&T has more than 170 million customers across its wireless, telephone, broadband and TV businesses. These customers will see extensive promotions for HBO Max in the coming months.
HBO already offers a programming streaming subscription, known as HBO Now.
But HBO Max wants a much fuller library of TV shows and movies – more than 10,000 hours of programming.
Netflix, Amazon Prime and Hulu have a huge head start. On Friday, Apple introduces a subscription bundle of programs called Apple TV +. And in mid-November, Disney will enter Disney +.
Tuesday's event will give WarnerMedia an opportunity to present its vision and plan. Dozens of deals for TV dramas, sitcoms, movies, documentaries and other programming have been announced in recent months. And plans for further programming will be unveiled on Tuesday.
"The maximum part of it is new original programming to expand it from children to adults," WarnerMedia Entertainment Chairman Bob Greenblatt said at a conference earlier this month.
Previous hits like "Friends" and "The West Wing" will also be available, in some cases because they are pulled by Netflix.