Deployment: May 19, 2023 at 15:35:12 Central European Summer Time, https://explorer.solana.com/tx/22fEcghPGgAnYCZkfjTxTeKQwX5rzWSx3c5CV9TikJmaAKWCpubCZYBx5ZJJPeNG1xWUPWMw3ooDhFBRYCR3tKYU

New event: PerpTakerTradeLog immediately logs your trade execution (#579, #584)

Previously you had to look at the logs from FillEvent processing to determine how much was taken and what the fees were. The new PerpTakerTradeLog event is emitted during PerpPlaceOrder and simplifies that.
Perp self-trade options (#533)

There are new PerpPlaceOrderV2 and PerpPlaceOrderPeggedV2 instructions that take an argument that controls self-trade behavior, similar to OpenBook.

The old instructions still exist with nearly unchanged behavior: They default to DecrementTake, which means being allowed to match against your own orders. But now you don't pay fees if you do so.
Update anchor to v0.27.0 (#582)

Mango used to depend on a fork of anchor. Now all patches are upstreamed and we have upgraded to the unmodified upstream version of v0.27.0.