Well, it’s here.
This is the link . Sony V2.00 Update
Here are the exact instruction on how to install the update: V2.00 update procedure
There are several reports that, in combination with FCPX’s last update, you can now natively import XAVCL into FCP.
This update does not automatically give you 4K. There’s another step (purchase) which hasn’t been made very clear at this date, but I’m sure we’ll find out soon. However, if you want to record in XAVCL right now, you can.
And here’s the link for obtaining and activating 4K. X70 4K Upgrade Key
And this comment from the FB X70 User Group regarding a rebate for early adopters of the X70: