End of Season Rewards for Mastery Score?

Im not entirely sure which forum this should be posted under, but i wanted to know if anyone knew anything about whats going to happen to Mastery Score at the start of the new season? Id assume it gets cleared, as everyones given a clean slate but will there be any rewards to show our accomplishments? I have 256 Mastery Score with Mastery Level 5 on four champions and Mastery Level 4 on five others.

Will any rewards be given to show the progress made to our Mastery Score or Champion Mastery?