The compact version will have a 2TB hard drive.
Sony isn’t the only one seemingly planning for a more powerful console with 4K resolution support. According to sources speaking to Kotaku, Microsoft is planning to do the same with Scorpio.
This is the code name for a 2017 iteration of the Xbox One which will have a more powerful GPU that can support Oculus Rift (whom Microsoft is pursuing a partnership with). This year will see the release of a compact Xbox One that could arrive in the fourth quarter. Three individuals speaking anonymously noted that they weren’t really meant to reveal Microsoft’s plans at this stage. Imagine that. Another source noted that the compact Xbox One would have a 2 TB hard disk.
As for Scorpio, development sources were concerned that even with a GPU upgrade for 4K resolution support, there’s currently no plan for an I/O transfer speed upgrade, which could lead to games having longer loading times due to the larger 4K assets.
Take this all with a grain of salt as usual but it should be interesting to see what Microsoft announces at E3 2016.