I also see it as doublespeak.The average JW will most certainly read between the lines as to what it 'really' means, that those who were Witnesses or repeatedly called on, or studied, or had some contact "with the truth",etc. will be viewed as "incorrigible" or beyond reform.I personally don't think anything has changed here.Perhaps some guy in the writing department had a tinge of conscience just slipped the word in and nobody caught it.
However,one thing adding the word"incorrigible" does accomplish is a sense of passage of time.Because sufficient time has to pass in order to determine if someone is "incorrigibly wicked". This then extends the idea that this 'system of things' could go on a LOT longer than expected and hence some time (read decades) would ultimately be needed in order to determine whether or not someone is "incorrigibly wicked".This would tie in with the generation change as well.
I also want to echo what others have mentioned and it's this line right here: .."Lovers of Jehovah need have no fear"...
It's quite common , especially for older ones, to speak of a "worldy" person as "they don't love Jehovah".In fact, I have even heard of some Witness children using the term.It's always used in the sense of them having a questionable (unlikely) outcome at the end of the system of things.I have no doubt that the Society is scrambling though, trying to figure out how they can stop so many from leaving while attracting new members.
It should also be noted that a person who is disfellowshipped is viewed as WICKED.The determination always is "weak or wicked" ? The wicked are disfellowshipped.Once again, this helps us to see how they view things.