This release contains a fix for a consensus bug stemming from unintentional signature mutations in OP_CHECKMULTISIG. We highly recommend upgrading this version to avoid being accidentally forked off the network.
Additionally the release contains some clean up from the Nov 15 hardfork. Specifically a new checkpoint is added at the hardfork block, the fastsync UTXO checkpoint is rolled forward to this new checkpoint, and the schnorr multisig script flag is added to the standard verification flags.
It also contains some connectivity improvements for IBD and a fix for an edge case panic during a reorg.