For every Rank you achieved in the previous Season, you will get to keep a % of your Rank progress for the new Season.
Depending on which tier you calibrate to, you will obtain some Unlock Tokens and Upgrade Tokens for you to use for the new Season.
The Tech Tree progress (including all buildings and upgrades) from the previous Season will reset.
Your Warship and Tech Tree will have a new layout, ready for you to start making those decisions on how you want to play for the new Season.