Nope, when you find out.....let me know
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I was skeptical that your wink meant that it would be difficult to find out, and it is!
There seems to be little out there to reveal it's real capabilities. The closest I could find was that it will distribute 50/50 torque across front and rear (
link), but there's no mention of individual wheels. I also came across an article which said there was 18 months of winter testing for the XF AWD, so that's encouraging plus they have LR tech to have called upon.
I'm assuming it will be a similar system to what's in the F-Pace, E-Pace etc and whilst I cannot find any AWD test videos (diagonal and roller tests) I did come across this E-Pace video. Although most of the time I notice that either both front or rear wheel are down before moving, I did spot this moment (I wish they had provided a wider shot) where it looks like a front and a rear wheel is off the ground whilst power is being applied. This would suggest that it is using ABS/braking to send the power to the wheel which isn't slipping.
https://youtu.be/BM2g9VeRArc?t=377