Nothing changed. It's been possible from the get go.
Actually I don't believe it's possible using just the AF of the XF and hasn't been from the get go. This has been true for me with 3 different tests on the different XF bodies all using the latest firmware. They ALL have worked the same way. All have the latest firmware for the XF, the CMOS back is running 1 release of firmware behind latest, as only changes I am aware of are UI for the back.
Net,
If you use an XF in AF mode to focus stack, the following happens about 90% of the time.
Lens worked with 35LS, 55LS, 80LS and 75-150 non LS.
1. Focus on distance spot with AF on XF, move to tools==focus stack, hit the focus gears icon, getting a number for the far focus motor number and set the distance spot, (upper silver bar),
2. Re-compose, for near subject, use AF, move back to tools==focus stack, ATTEMPT to set the near spot, 75% to 80% of the time the camera will just reset the far point for the near point. I have done this enough times to know that this process is not working correctly. 1 out of 5 times the two points will register correctly, the other times the camera just picks the previous focus point (near or far which ever one was first recorded).
Note, tethered in Live View, this does not happen as the point clicked on registers correctly for both near and far, however in the field, I don't find this to be very useable. NOTE, clicking on the focus point that is showing on the tethered Live View screen, as in a studio setting.
The ONLY way I can get it TO work correctly is to do the following:
1. Focus on distance subject matter with the XF AF, then, jump into Live View, while in Live View move to tools==focus stack and then hit the gears to register the focus point and hit the far. NOTE, the first point works most of the time.
2. Go back and recompose and focus on near point. Jump into Live view and check the focus, if it's correct switch the lens to MF mode with the clutch on the lens, then go back to tools==focus stack. The gears will show red since the AF is off, clutch the lens back to AF mode (more than likely lens will slightly jump out of best focus) so since you are still in Live View tweak the AF (yes move the focus ring with the AF on, you are not moving very much and I don't think you will hurt anything, at least I hope not), now that that AF is on, the gears will register a near point, and input that.
3. Move the near point just a bit past optimum focus with the manual dial, and add 1 more to the total stack. This just makes sure the intended subject is in full focus.
This method works, but only if you have a CMOS back, thus I feel that a vast majority of XF users possibly will have similar problems as mine but since they don't have a working Live View, they can't make the same Live View checks.
Paul C