If it's only in Poland, this is just a beta test for gathering metrics. If this letter is also in other countries, we may have reason for concern.
however, I can't imagine the GB pulling a stunt that would no doubt create massive negative PR within the bOrg and outside of it.
I've long suspected since the 90s (when the "kingdom news" campaigns first began, followed by memorial & convention invitation campaigns) that they were just gathering data; how quickly can we print X number of pamphlets? How quickly can we ship them? How effective are the bethelites and elders at keeping a new release confidential before the unveiling at the service meeting? How quickly can each congregation distribute one to every house on the territory and follow up on the not-at-homes?
with this new "return" brochure, it seems like they may be on another data-gathering mission and 2015 is a year marked for the case study. How many DID go inactive and why? How receptive were they to the invitation to return? Is there a geographical, socioeconomic, or age correlation? Think about it. If you're running a multi-billion $ global corporation in the Information Age and you've just rebranded yourself, data analysis is essential in identifying predictive indicators within your target market. This data will help them more accurately predict bOrg.tv viewership, whether or not donation pledges are realisticly being met, whether or not to sell off, merge or construct new KHs... It goes on and on.
i seriously doubt the GB will place the enormous additional responsibility on local elders to flush out every inactive member in some kind of massive purge. They want positive numbers on their end of year reports, not negative ones.
i became inactive in 2008 so I may be safe, but I DID have a sheperding call visit from 2 elders in 2015 where I told them that I struggle with doubts (I did not go into any detail). So.... I am a little concerned that I'd be on their radar since we did reestablish contact in 2015. Dammit. I really don't need the stress right now. Hopefully, this isn't a big deal. I keep telling myself that.