I have not seen any coverage online for the new G Series XQD version 2 memory cards (used in the Nikon D4/D4s DSLR cameras) that can deliver 400MB/s read, 350MB/s write speed and capacity up to 128GB. All cards also include a USB 3.0 reader ($38 value). The price range from $163.50 to $799.95:
Lexar's XQD memory cards currently go "only" up to 64GB and 168MB/s read speed (write speeds are even lower).
The new Sony XQD cards will start shipping on November 3rd. Additional information from Sony's website:
The new G Series is compliant to XQD Format Version 2, both PCI Express Gen.2 and USB3.0 interface are supported on a newly-developed controller for high performance.
The G Series delivers increased read 400MB/s and write 350MB/s speeds, which is three times the speed of the previous N Series cards.
Sony's unique media technology enables these G Series cards to provide efficient data writing, dependable recording of 4K video while avoiding speed degradation.
The larger capacity 128GB model expands the line-up allowing up to 40 minutes of 4K XAVC Intra 422 60p (600Mbps) recording with Sony's 4K video cameras.
The G Series is supplied with a dedicated USB 3.0 adapter, which offers convenience and efficiency for professional workflows. It dramatically reduce ingest time by less than half compared to the fastest Compact Flash card even for large quantities of RAW images or data-intensive 4K video files.
Here are the detailed specifications of the new XQD cards:
The XQD 2.0 specifications were announced back in 2012.