Yes you read correctly the GM/final release of iOS 4.3 is here. You can get it via Jailbreak Zone along with release notes. Remember you don’t need to have your devices UDID number registered on a dev account to use this firmware. The only requirement is iTunes 10.2 available here. Also, remember the dev-team has not released a jailbreak for this firmware as of this posting. So, if you rely on jailbreak or unlock give it a week or so and the jailbreak should become available.