I understand when read replicas are implemented there would be one master where all writes take plac

I understand when read replicas are implemented there would be one master where all writes take place, right?
Is there any plans to have multiple write masters, based on table partition (for instance)?
Imagine a User table, where users write their own data. Would it be possible to partition this table based on location?
I mean, to create a partition of this table for each location (america, europe, asia) that would become master for writes, and this way a user would write as master to the partition in its location (and then read replica would replicate it to other locations)
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