What’s New at Shopify?

Update: Merchants activating Markets Pro, who decide to set shipping rates manually will be notified if they have incompatible rate configurations with Markets Pro, with the goal to help merchants transition to the service.
The guard rails are the following:
Carrier calculated rates at checkout will be replaced with DHL Express rates by Markets Pro; any custom handling fees will be removed, and customer-facing transit times will be changed to express.