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> offered in 128GB, 256GB, 512GB, and even 1TB capacities

Same as current Apple offering, although Retina MacBook Pro's only supports only 2x link.

I hope some larger capacities will become available in next year or two. Also I have noticed no difference in daily computer use when went from 500 MB/s SATA drive to 900 MB/s PCIe.

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I have a 1TB SSD in my late 2013 15" MacBook Pro Retina and System Information is reporting that it has a 4x link. Even with the additional overhead of having FileVault enabled I still see read/write performance in the region of 1000-1100 MB/s.

The 1TB disk in those is PCI-E.

Actually, it can go to 4x : http://blog.macsales.com/25878-owc-gets-1200mbs-from-ssd-in-...

They simply plugged in an SSD from a 2013 Mac Pro. Go figure.

But can they plug in the new Samsung SSD (when available) or any of the PCIe-SSDs currently available on Amazon?

My understanding is that Apple (deliberately) changed the physical shape of the PCIe-SSD connector so you could not upgrade the SSD yourself.

Interesting. EveryMac reports only 2x.

I've seen that OWC article where they get up 1200 MB/s and though that might be still achieved by 2x link width.

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