According to Foresight News, Merlin Chain has announced that an upgrade to its testnet is scheduled for today at 16:00. The upgrade process is expected to last several hours, during which the team will conduct a comprehensive test. The upgrade includes support for precompiled contracts SHA256, ecAdd, ecMul, and ecPairing, which will improve AA transactions. The upgrade also allows for multiple transactions within a single block, with each block having a timestamp.