At this time NO - apparently Apple has once again come up with a proprietary drive/storage system. There are no 3rd party solutions.
The MD711LL/A configuration has flash storage. Neither configuration has a hard drive. The higher-end MD712LL/A configuration also can be equipped with 512 GB of storage at the time of purchase .
*Apple does not intend for one to upgrade the storage after purchase, but it is theoretically possible. As first reported by AnandTech, this model uses a PCIe-based SSD rather than a SATA-connected one. Specifically, it uses a custom Apple design with a "PCIe 2.0 x2 interface, capable of a theoretical maximum of 1 GB/s in each direction."
So you'll have to be patient... OWC generally finds ways to upgrade these machines, but at this time they have not found an alternative.
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