noun
successor model; later model
Commonly used for electronic devices, machinery, vehicles, and other products that replace an earlier version.
このスマートフォンは前モデルの後継機です。
This smartphone is the successor to the previous model.
後継機の発売が待ち遠しい。
I can't wait for the release of the successor model.
Compound of 後継 (succession) + 機 (machine). The exact historical derivation is uncertain, but the word follows a common pattern for naming product generations.