Getting the flippers right is definitely a big deal, and I have no doubt they will.
But as for DE flippers, I've played them all through the 90s and always thought the "clunky flipper" complaint made by a few of the BW crowd on RGP was simply a gang mentality that went on for too long. And I'm mostly proven right in that people who are newish to pinball in the past 10 years come and play GnR, Lotr etc at my house, right next to MM and MB etc, and never ever even one time complain about the feel of the flippers. Gottlieb's 35v were definitely late to the party, but beyond that the difference from the early 90's to now is mostly in people's heads. A DE/Sega/Stern flipper with new sleeves and stops is just as smooth as any BW flipper to me. The only difference seems to be the parallel wound coil does seem to retain its snappiness a little better when in drastic need of new sleeves/cleaning, which is IMHO where that myth began, with players playing crappy maintained games on location in the 90's.
When I was at UF they showed us a film of a study they did involving chemically sensitive people allergic to carbamates, pyrethroids, etc. They had a couple dozen chemically sensitive people sitting in a clean room and informed them they'd be testing a new synthetic pyrethroid which was odorless, microencapsulated and non-detectable, and should not bother them at all. So they dressed up a professional looking pest control tech and had him apply it to the baseboards well away from everyone, and one by one they started gagging and wheezing, some sat comfortably, but 3/4 of the room were literally tearing from the eyes, snot and the works, and some left before they informed them that distilled water was the only thing which had been applied.
The mind is a tricky thing, and can cause all kinds of mental reactions which trigger real physical actions. And gang/herd mentality works overtime on some folks.
It is amusing that there's next to no complaints about DE/Sega flippers by hobbyists in the past 10 years, other than the overworked coils on Stern games needing a boost after 30 minutes of hard use, when the previous 5-10 years involved a complaint per day on RGP. I've actually been told the flippers on my GNR feel better than any in my collection.
Anyway, KEF is a great and finicky player and, Jack's boasting aside, I just can't fathom WOZ shipping with flippers which don't feel right. Remember, they haven't even put it out on proper test yet.