EU Import One Stop Shop (IOSS) support

[Max1957]

On the 1st July the EU introduces a new tax regime for UK e-commerce distance sellers selling into the EU.  For sales under Euro 150, e-commerce sellers can opt to charge destination country VAT rates to speed up delivery.  For sales above Euro 150, sales will continue to be VAT free with the customer having to pay VAT / charges when the package arrives in the destination country.  Will Shopify be implementing this threshold so that VAT is included/excluded automatically, or will sellers have to process refunds above Euro 150 or use an external app?  Any help on this would be appreciated..