Of course, after the Rock is done with his part of Rampage we don’t know where he’ll be going from there.
One expects that with an April 2018 release date, The Rock will begin filming this one fairly soon after the holidays, we’re assuming the guy will take a break for the holidays.
While we can’t be positive The Rock will appear, we’d call it likely.
With it being very effects-heavy the post-production period will probably take time.