The SRE is apparently retiring the previous citizenship exam at the end of 2017. A new one will be put into place starting January 08, 2018.
The old "Guia de Estudio" had a list of 100 Mexico-related questions with multiple choice answers.
The new "Guia de Estudio" is a list of links to scholarly treatises in esoteric Spanish totaling over 1,000 pages.
It begins with an in-depth study on the etymology of the word "history." It also touches on relevant topics such as globalization, infant mortality rates, average housing size, federal science spending, rates of sub-employment, corn production trends, & of course the entire "CONSTITUCIÓN POLÍTICA DE LOS ESTADOS UNIDOS MEXICANOS" (296 pages of highly annotated Spanish legalese).
It is entirely possible to read all of the material; somewhat less possible to memorize it all; & in the end, highly unlikely to glean any relevant information that might be buried within the avalanche of fiscal statistics & academic climaxes.
I initially thought they might only have changed the Study Guide & kept the actual test the same, but the man with whom I made my appointment at the SRE office mentioned that he thought the new test would be essay based. He didn't know anything concrete, of course, the lawyers I have talked to have no information about the new test, & there is no information online. I assume no one here knows anything either, since no one will actually see it until the new year.
My appointment is on January 8th, 2018. I will post updates here in case anyone is interested. Please comment if you have any information about the new 2018 citizenship exam.
Hoping for the best; expecting the worst.