2016 pre-season ranked

So when i logged in after installing the new patch i got some information in my screen about playing ranked in the preseason that could depend if i played ranked in 2016 or not. I just hit p5 and dont want to play ranked anymore until i get my season rewards and the ranks reset. Do i really need to start playing this ranked flex? And if i dont will i still get my rewards?{{champion:32}}
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