The next generation; the generation that follows the current one. Often used for technology/products (next-gen) or future generations of people.
次世代のスマートフォンはさらに性能が向上するだろう。
Next-generation smartphones will likely have even better performance.
次世代のリーダーを育てることが重要だ。
It's important to develop the leaders of the next generation.
この技術は次世代通信に応用される予定だ。
This technology is planned to be applied to next-generation communications.
若者は次世代を担う存在だ。
Young people are the ones who will carry the next generation.