debut; first appearance; new release
Used for the first public appearance of a product, person, or work. Often seen in promotional contexts.
The newly released smartphone is getting a lot of attention.
Her debut album will be released next month.
新登場 is a marketing phrase for something 'newly appearing,' often used interchangeably with 新発売 in ads but with a slightly softer nuance.
Compound of 新 (new) and 登場 (appearance, entry). The word follows standard Sino-Japanese word formation.