"Gone is Windows RT, casually tossed in the dustbin in favor of Windows 8.1. Microsoft also ditched the Surface 2's ARM chip in favor of Intel’s latest “Cherry Trail” Atom X7.
... 64GB of storage, the same amount found in the $799 version of Surface Pro 3 and the $599 discontinued Surface 2. (A more robust $599 Surface 3 variant with 4GB ofRAM and 128GB of flash storage will also be available, together with a future model with LTE connectivity.)"
Microsoft Surface 3 vs. Surface Pro 3 @ GizMag