When the rank reset?

My title say everything when do the rank system restarting ?

> The Cartographer’s Gift update also brings with it the arrival of Seasons, which we last talked about in October. Seasons are a new competitive feature for Arena which will give you a chance to continually challenge yourself in ranked playlists, and also prove that you’ve improved your game since the last Season. The January 2016 Season will begin with the Cartographer’s Gift update (set to drop the week of December 15) and end on January 31, which will make the first season a little over a month long. Moving forward, we’re going to keep an eye on feedback regarding season length. We’ve seen your comments and concerns about Seasons being too short or too long, and we will be looking to hit the sweet spot to ensure that the duration feels just right.
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> As stated above, you’ve still got at least a week to grind on your current (Pre-Season) ranks. Once the update is here and the season begins, all of your Pre-Season ranks will still be viewable on your Halo Waypoint Service Record, and all CSRs for ranked playlists will be reset, giving you a chance to place in each of these playlists again. As mentioned previously, at the end of each Season, those who qualified in at least one playlist (by playing 10 placement matches in any ranked playlist) will earn an exclusive seasonal pack reward emblem, only available that Season.

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> > The Cartographer’s Gift update also brings with it the arrival of Seasons, which we last talked about in October. Seasons are a new competitive feature for Arena which will give you a chance to continually challenge yourself in ranked playlists, and also prove that you’ve improved your game since the last Season. The January 2016 Season will begin with the Cartographer’s Gift update (set to drop the week of December 15) and end on January 31, which will make the first season a little over a month long. Moving forward, we’re going to keep an eye on feedback regarding season length. We’ve seen your comments and concerns about Seasons being too short or too long, and we will be looking to hit the sweet spot to ensure that the duration feels just right.
> >
> > As stated above, you’ve still got at least a week to grind on your current (Pre-Season) ranks. Once the update is here and the season begins, all of your Pre-Season ranks will still be viewable on your Halo Waypoint Service Record, and all CSRs for ranked playlists will be reset, giving you a chance to place in each of these playlists again. As mentioned previously, at the end of each Season, those who qualified in at least one playlist (by playing 10 placement matches in any ranked playlist) will earn an exclusive seasonal pack reward emblem, only available that Season.

Thank you ^.^