An anonymous user has leaked the CFW to moderators on ps3hax forums. The firmware is reported to be mostly stable, save for a few phat models and some scenarios. The firmware includes Cobra 7.0.1 features, and is bundled with an unreleased version of the Rebug Toolkit.
Users are recommended to downgrade to 3.55 OFW/CFW before installing this update.
Downloads, info, and source