I don’t know how they would easily expand memory since that is an integral part of the System On a Chip design. But I’m not a chip designer. Even in the iMac line will you be limited to Apple only graphics? I would think lack of graphic card options would seriously limit the iMac Pro’s desirability.No way. Apple (hopefully) learned their lesson with the Mac Pro 2013. There's no way whatever they design will not allow internal and external expansion, though I do agree, the casing will be somewhat smaller.