So what will happen to my rank when role queue comes?

So I heared they are doing the new role queue thing in NA and KR server and that it will come to EUW likely the 2nd split (which is 84 days from now), but what will happen to the rank I have now then? If I am getting different ranks for every role you can queue up for, where does my rank go? will every role be the rank I have at the end of split 1 or will I have to play more placements? Also will flex still exist then? Will I still exist? Role queue raises some questions for me. Sounds like they could have better started with it at the start of the season.
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