Exactly this. your rank does not carry over, but your mmr standing at the end of the season, along with your ten placement matches, come season 8 will determine your new rank.
Please do not use this time to dip into ranked to troll or meme or just to have fun if you are going to feed your ass out playing a champion you know you suck at. Looking at all you asian fuccboi mains out there 
Well, yes. However I think it's important to note that the game will factor the end of last season into the ranking even if you've climbed a lot or fallen a lot. If you ended last season in plat, you probably won't start next season in Bronze unless you fell like a giant rock.
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But me and my friend we will try to win no matter what, one downfall we have is we never surrender too but thats beyond the point but i dont want to bbe placed in low silver or high bronze i want to start b5 and climb all the way up from the start so there is that.
With that in mind I then use preseason as a way to try new champions in ranked to see if they would work at seasons start and trying cool bot lane combos to cheese in early season(e.g: shen ali bot with relic is just broken)
So although your mmr does matter in pre-season something you need to remember is that Pre-season is a time for everyone to 1) take a break from the game or 2) try new things out for the new season
