#4: Could more matches be announced

WWE SummerSlam 2019 has come together to be a huge show, with ten matches being announced.
However, that might not be the end of things just yet, as according to the Wrestling Observer Newsletter, an eleventh match is expected to be added.
According to Dave Meltzer, a match between Cedric Alexander and Drew McIntyre is expected for the show which already features matches for six different championships.
Interesting, none of the three main roster tag team titles will be defended at the show. Neither the New Day, the OC, or new WWE Women's Tag Team Champions Alexa Bliss and Nikki Cross are booked to compete.
In addition, several huge stars have not been announced for matches These include Braun Strowman and Roman Reigns, the latter of which closed out last year's SummerSlam in a major way, finally ending Brock Lesnar's 500+ day reign as WWE Universal Champion.
Whether Alexander Vs. McIntyre is added remains unclear, though it'll certainly be interesting if it does get added to the show.
Becky Lynch has been challenged HERE.