What a wonderful design and beautiful notebook. What a shame, just like the first Thunderbolt port MacBooks, this will have a useless port for external storage peripherals. First there will have to be a USB C to USB adapter which adds bulk - assuming one will be available. Then we will likely wait months if not ears for any affordable USB C peripherals. First there was FireWire, then Thunderbolt and now a generally useless USB C for much of anything except power.
As for those who say there will be "tons of USB C devices because it is a standard" - history is not on your side, certainly not in the near term.