Patch notes will always be found over on the Updates subforum (Information > Updates), as for this one, it currently says, "Update details will be announced at a later time."

Thanks for posting this question, I was thinking about checking for an update but had decided not to until morning...glad I checked the forums one more time!

*EDIT* Oh and they are also found on the front page of the lodestone (na.finalfantasyxiv.com for North America)