Yukusaki doesn't mean future in Japanese. The Japanese word for future is Mirai, also spelt as 未来. Yukusaki is more of a phase like "where to go", it doesn't totally have a meaning
Yuku, also spelt as iku, is a version of the word "go". Ikimasu is like I will go. -saki is like a time meaning, like "will" or "did", but it doesn't mean future.
Source: i speak japanese