UPDATE: This does NOT come on an SxS card or include an SxS card. The camera must be sent to a Sony service centre to be upgraded, and I’ve only seen the offer for USA customers.
Hot news is that the S-Log option for the PMW-F3 can now be had for $899 USD. You can have all the benefits of S-Log and 4:4:4 RGB out. If you paid full whack for the S-Log option then you can get $2500 USD off a Sony SR-R1 or the Sony F3 servo zoom lens.