我不推荐用“I'll meet you some day in the future.”听起来有点Chinglish.
老外日常不太说in the future. 只用 I will meet you some day 就足够表达“在未来”
Some day, we will finally meet
Some day, I will meet you there
We will meet some day, finally
考虑一下上面这几个,听起来自然些。
在未来的某一天 我总会遇见你
I am to meet you one day / some day in the future
I'll meet you some day in the future.
In one day in the future I will meet you