The Catholic News Service has an article online called “The Mystery of the Missing Encyclical”. No, we are not talking Pius XI’s encyclical against Nazism here (although that too is a “mystery” of sorts), but the other problem of the “third boot” we have been waiting to fall: The Encyclical on Faith.
I think CNS has got it basically right. The Pope will still write and issue the encyclical on faith – they’re just not saying which pope.
Same goes for the other, fourth “boot” yet to fall (“he’s got two one-legged friends, Min”) – the Post-Synodical Exhortation on the New Evangelisation. If it is Pope Scola or Pope Ouellet who finishes these two documents off, I expect that we will find it harder to do the “source criticism” on it than it was with “Deus Caritas Est”.