Magento Enterprise Edition is available for an annual subscription fee that is tiered based on the amount of GMV that will run through the Magento software. You can work with a Magento sales representative to determine pricing for your business or client.
Will the Enterprise Edition licensing fees be different for Magento 2.0 vs Magento 1? Have Magento 2.0 Enterprise Edition pricing details been announced? Will annual Magento Enterprise Edition costs stay the same?
Is there any minimal starting point?
Use the Community Edition for free: it serves as a minimal starting point.