Samsung already kicked off Galaxy S8 production, to make more than 10 million units initially
Samsung Galaxy S8 leaked image
Samsung is also gearing up for a truly global Galaxy S8 launch, preparing to start selling the devices at the same time across most of its markets. This report says that Samsung will manufacture 4.7 million Galaxy S8 series handsets in March and 7.8 million in April. This combines for a total of 12.5 million units for the first month of availability of the Galaxy S8, which will go on sale soon after the March 29th announcement event.
There are no details on the S8 to S8 Plus ratio, and whether the larger phone will have any sort of preference in terms of actual manufacturing. The figures above are estimate coming from Korean media reports, rather than official figures, so do take them with the usual grain of salt.