Bitcoin Core has unveiled the release candidate for its major update, v30.0rc3, now available for testing. This version introduces significant improvements in networking, mempool policy, mining, and RPCs. Notable updates include an increase in the default datacarriersize to 100,000 and the addition of a new Bitcoin command line tool. The release also supports TRUC transactions and features an experimental IPC Mining Interface. Additionally, the 'maxorphantx' option has been removed, reflecting changes in transaction handling.