I can't wait to see what the next story is all about.
I'm really interested to see what's going to happen in the next episode.
この場合、次のような言い方ができますよ。
ーI can't wait to see what the next story is all about.
「次のストーリがどんなのか待ち遠しい」
ーI'm really interested to see what's going to happen in the next episode.
「次のエピソードでどうなるかすごく気になる」
ここでの「気になる」は I can't wait to ... や I'm really interested to ... を使って言うと自然な感じで良いでしょう。
ご参考まで！
カナダ 
