ZENIT mentioned in a story published tonight that the cardinal in pectore’s name would be released after a few decades have passed, that is when Pope John Paul II’s archives are opened.
For an example of the timespan, Pope Pius XII who reigned during WWII, had his archives opened in just the past few years. The cardinal in question will most likely have died himself by the time it is revealed.
While I did not know that and had not ran across that in my previous research, ZENIT has been a trusted source of mine for years. If I find out anything more, I’ll pass it along.