Greg "2K" Laabs posted the following message on the Official Civ5 Forums:
"Happy Friday everyone! Friday is already an awesome day of the week, but I am here to make this one just that much better, and the way I'm going to do that is by giving you the full patch notes for the upcoming patch.
As has started to become tradition, these notes come with an intro straight from the devs' own mouth (well, email client):
Greetings from the Civ V team! Another couple of months have passed, and the team has been busy continuing to refine and improve the game based on your feedback. Aside from the already-announced additions of Hot-Seat and Replays, an entire balance pass has been integrated into the game. New features, gameplay systems, and Diplomacy modifiers have all been added. AI refinements continue as well, and the AI is now better than ever at challenging the player. As we move into summer, we’ll continue to bring new and exciting additions to Civ V, including improvements to Multiplayer, and other core areas of the game. Your continued engagement and feedback is what drives the team to keep working, and to make Civ V everything that our fans expect, and for that, we thank you.
And before anyone asks, the ETA is still the same as before: late June or possibly early July."