According to Bloomberg Quint ( [link to www.bloombergquint.com (secure)] they suspect that Trump will try to suppress some of Mueller's report.

Here's where 5-D Chess becomes fun when making one assumption: Mueller report shows DNC collusion with Russia.

Now:
Mueller releases report.
Trump purposely "suppresses" some of it.
DNC & MSM go predictably ballistic.
Pelosi demands to know what secret Trump is hiding!
Warren cries about how unfair it is and that people deserve the right to know!
Schumer bloviates about how it must be real important and earth shattering if the Mean Orange Man is hiding stuff!
They sue.
They file court documents.
>>> It goes to the courts.
Courts, on the side of the DNC, force Trump to reveal what he has suppressed.

Then, when it all gets unredacted and released, it turns out the TRUTH is the DNC collaborated with Russia the whole time. (And much, much worse).

Then, the MSM has to report on it, right?

Ah well. 2019 will be interesting.