The SSD Review published a review on the Sony VAIO Pro 13 Ultrabook Native PCIe SSD 1GB/s Performance Fastest Ultra Speed To Date

A quote from the article:

A few weeks back, we published our review of the Sony VAIO Pro 13 ultrabook where we discovered that there were two different configurations of the VAIO being shipped, that with a SATA M.2 SSD and that with a native M.2 PCIe SSD. Not only did the system that we received contain a SATA M.2 SSD, but also, a quick check of the internet revealed that there were several Sony VAIO Pro 13 customers just as surprised and disapppointed. In subsequent conversations with Sony, we learned that certain pre-configured Sony Pro 13 models shipped with the M.2 SATA SSD, vice the native M.2 PCIe SSD.

 Sony VAIO Pro 13 Ultrabook Native PCIe SSD Review 1GB/s Performance Fastest Ultra Speed To Date @ The SSD Review