only means that they didnt run into any issues when they did their testing and went ahead and gave the ok for it to be released. or they ran into less issues than the other carriers and were able to have it kicked out sooner.
Closing this topic, please refer to the release notes thread for questions or concerns.
Before reporting a problem after the MR, please be sure you've done the following troubleshooting:
Update all installed Android apps (number one common reason for battery drain after an update)
Do a partition cache wipe. Instructions here (clears out the crud from the system)