question about ranked and pre season?

SO what my question is that after the end of season 7 November 8th.!! I ended G5 alright so is it possible still being able to play ranked during pre season will I get demoted? will I loose my rewards or are my rewards locked in ? someone please explain this to me IF a rioter could explain it to me that would be great I would highly appreciate it.
Report as:
Offensive Spam Harassment Incorrect Board