The phrase "official debut" means the first public appearance or introduction of something or someone in an official or formal setting. Full definition
Here is one more tablet PC that is awaiting official debut this month and it's one more to have the Android as its operating system. (goodereader.com)
The all - new 2014 Subaru Forester has made official debut at the 2012 Los Angeles Auto Show. (japanesesportcars.com)
Mozilla released a test version of its upcoming Firefox Quantum web browser this week in preparation for its upcoming official debut in November. (fortune.com)