According to the Daily Planet, dYdX officially announced that Testnet 2 will be shut down at 23:00 on September 11, and Testnet 3 will be launched on September 13. This is the last planned network reset, and all future updates to the testnet will be made on-chain. Updates to Testnet 3 include: conditional orders, MEV nodes, Delay-msg module, V4 support market, support for using governance tokens to pay for gas fees, etc.