There is no programme to refit old 77Ws at all, unfortunately, at least that we know of, thus there are only a handful (6 or so..?) aircraft with the new F cabin, and the 10 77Ls are slowly being refitted with the new Y and J in 2-class config (2-2-2 in J), with ADL getting the new cabin soon. There is also no announced programme to refit the A380s. My suspicion is that there won't be a major refit programme, but rather that eventually (in another 2 years or so perhaps) we will see the oldest 77W cabins either being refurbished to the new config or those aircraft being phased out completely (this is perhaps the more likely outcome given current pilot shortages, load issues and the 77X programme with deliveries beginning in a few years in addition to the 787s coming in in a few years' time). It may thus be another 4-5 years until even a somewhat significant portion of the fleet (>25%) has the new cabins