(Slightly off topic, since the following does not have to do with the resurrecection, but with the general view of the 144,000.)
One change is in the way the Society looks at the number of partakers. The declining number of partakers was supposed to be proof positive that we are in the last days. Under the subheading 'Six Convincing Lines of Evidence [of being in the last days]', the following article says,
"Sixth, the number of genuine anointed disciples of Christ is dwindling, though some will evidently still be on earth when the great tribulation begins. Most of the remnant are quite elderly, and over the years the number of those who are truly anointed has been getting smaller." (Watchtower Jan 15, 2000, p 13)
-- and --
"There is every reason to believe that the number of anointed ones will continue to decline as advanced age and unforeseen occurrences end their earthly lives." (Watchtower Aug 15, 1996, p 31)
However, in recent years the number of partakers has increased significantly. Obviously, the declining number of partakers proved nothing regarding the last days.
Another slight change is in when the number of 144,000 was sealed. Previously it was viewed to be in 1935. The organization said,
"Logically, the calling of the little flock would draw to a close when the number was nearing completion, and the evidence is that the general gathering of these specially blessed ones ended in 1935." (Watchtower 1995 Feb 15 p.19)
-- and --
"There is good reason to believe that the number of 144.000 anointed Christians was complete decates ago...The facts over the decades reflect both the completion of the calling of the anointed and Jehovah's blessing on the growing "great crowd," who hope to survive "the great tribulation."" (Watchtower Aug 15, 1996, p30)
But because of the increasing number of partakers in recent years, the Society is forced to take a step backward in the 1935 date, and it now says,
"Thus it appears that we can not set a specific date for when the calling of Christians to the heavenly hope ends." (Watchtower 2007 May 1 p.31)
And what about all those new partakers? The Society suggests that some partakers may be emotionally unbalanced, or are influenced by past beliefs, and are partaking by mistake.
"...A number of factors — including past religious beliefs or even mental or emotional imbalance — might cause some to assume mistakenly that they have the heavenly calling. We thus have no way of knowing the exact number of anointed ones on earth; nor do we need to know." (Watchtower 2011 Aug 15 p.22)
Like so many Watchtower beliefs, this one is a state of flux, and there is confusion all around.