WWE.com has released their official preview for the show with five points of interest. The biggest story is Brock Lesnar making an appearance, following his successful Universal Title defense against Roman Reigns, Braun Strowman and Samoa Joe. Here are the five major points from the official preview with a video for each:
The legend of The Beast lives on.

Braun Strowman manhandles Brock Lesnar in unprecedented fashion: SummerSlam 2017 (WWE Network)
Will Seth Rollins & Dean Ambrose be able to function cohesively as Raw Tag Team Champions?
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Dean Ambrose & Seth Rollins "own tag team wrestling": Exclusive, Aug. 20, 2017
Will Titus Worldwide get Akira Tozawa a hasty rematch?
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Neville puts WWE Cruiserweight Champion Akira Tozawa to the test: SummerSlam 2017 Kickoff Match
The Demon reigns over The New Face of Fear.

"The Demon" Finn Bálor puts a twisted take on Bray Wyatt's entrance: SummerSlam 2017 (WWE Network)
Sasha Banks withstands “Five Feet of Fury”.
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Sasha Banks sends Alexa Bliss crashing into the turnbuckle: SummerSlam 2017 (WWE Network Exclusive)
Opinion: I’m actually excited about tonight’s show, assuming it leads to the most obvious huge match in the world of Strowman vs. Lesnar. The seeds have already been planted and hopefully we can get to that match sooner rather than later. The other interesting part is Reigns, who took the fall last night and will likely be requiring a rebuild starting tonight.
What interests you the most about this show? Where do you think will headline “No Mercy 2015”? Let us know in the comments below.