For the most part, the notes are your standard patch note fare: bug fixes, quality-of-life improvements, some UI tweaks, and so forth. But there are a couple of gems that stand out among the rest. For instance, players with the Genetic Engineering skill can do some gene-splicing to create their own unique pets. Currently there are 40 different hybrid and pure-species pets that can be genetically engineered, so the mad scientists in the crowd should have many options when it comes to playing God. The site's lore and bestiary sections have also been updated for the lore junkies out there. The full, rather expansive April update notes can be found on The Repopulation's official site, so if you're interested in all of the minutiae, just head on over there and check it out.
[Thanks to Halldorr for the tip!]