This looks familiar... The all-new and twice-as-fast flash memory has the exact same ICs as the one found in our recent teardown of the MacBook Air 13":

Samsung S4LN058A01 PCIe 3.0 x4 AHCI flash controller

Samsung K4E4E324ED 512 MB LPDDR3 DRAM

8 x Samsung K9LDGY8S1D-XCK0 16 GB flash storage (128 GB total)

Just like its MacBook Air brother, this SSD benchmarks at significantly faster speeds than the previous generation.