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Have anyone tried the new Sandisk cards that support VPG-65 with speed up to 160 MB/s?
http://www.sandisk.com/products/memory-cards/compactflash/extremepro-160mbs/?capacity=128GB

Tested on 5D mkII, mkIII and 7D.

The cards was tested to be compatible with magic lantern and canon firmware unlike the 1050x.

Benchmarks show similar results as 32 or 64 gig 1000x. The cameras seem to be the limiting factor.

When formatted as 256 gig via your computer or straight from the box, the cards will initially be seen as such by the camera.

However, when you format the card in-camera, it will reduce its capacity to 128gig.

Tested the 5dmkII for capacity test indicates it cannot record past 128gig on the card. (we recorded 116gig)

For now only 2 card readers are confirmed and tested to be compatible, the lexar and transcend card readers.
Other brands will only show the CF card as 132 gig only.

According to Canon themselves the maximum write speed of the Canon 5d mkIII is 167MB/sec.

This is the statement by Canon:
The DIGIC 5+ processor has also brought the ability to make use of UDMA 7 memory cards, enabling fast write speeds for both still images, where data is produced in bursts, and HD video, where continuous stream data is sent. This allows memory cards with a sustained write speed of up to 167MB/sec to be fully utilised, meaning the camera is future-proofed to be able to work with faster memory cards than are currently available in the market.

Canon also says that cf cards with the size of 256gb should work with the 5d mkIII, even larger than that would be possible.