From the latest documents on CMA reviews (that Ryuu shared ealier):
this is after discussing the various statement MS have made regarding Cod and it's willingness to keep the titles on competition.
"Such commitments can form the basis of undertakings that are provided by Microsoft to the CMA to alleviate the potential harm that it has been suggested may happen as a result of this transaction. While we believe that such undertakings should not be required given our belief that this transaction does not result in a substantial lessening of competition in any of the identified markets, these commitments would act to safeguard the many benefits to consumers that result from this transaction."
If that's truly what the CMA thinks now I don't know how this review could potentially result in a block without seeking remedy with MS
