Out this week is the third Novel in the post-WFC trilogy - Retribution.
A preview has been posted up on the Transformers Facebook page.

Since the Covenant of Primus book should cover the events of this book (as it is part of the Aligned Universe, between FOC/Exiles and TFPrime cartoon), but I doubt that it would have gone into too much detail in terms of spoilers... or else, people wouldn't need to buy this book to find out what happens.

(no, I haven't read all of the Covenant of Primus book yet to know if it is true)