That dlc will mainly interest players focused on the european continent. There is quite an interesting revamp of the papal mechanism, as well as a few update on how the HRE works. The endgame is also improved with the new "hegemon" mechanic and a fun way of dealing with the spreading of revolutions.
Overall an interesting add-on, yet it is a little bit of a shame that the new sprites are not included, and yet again only available to the customers that buy the dedicated cosmetic "content pack" dlc.