Perhaps they need time for the Spirit of Nysa to jump to Beagle Point before the new FSDs appear in storage.Might be earlier, especially that the CG ended sooner, but it's not tied to weekly server maintaince.
You should receive an ingame email when it's ready.
I had a quick go yesterday evening, but could see that I wouldn't have time to deliver the 10K or so that appeared to be needed to end in the top 25%. Had fun delivering 3K and then called it a night.
I'm curious to see what the stats are of the special drive when it's added. If @Northpin is right and it's no longer ranged than any other engineered FSD then at least I won't need to ban stuff from the A* Challenge, but I'll feel sorry for those who gave up a weekend to get into the top 25%.