How do I join the NXT 2.0 (Ardor) distribution if it isn’t an ICO? And how does it affect NXT 1.0 holders?

Can someone explain to me how to join the NXT 2.0 (Ardor) distribution? I’ve been reading you can’t buy into the coin initially or can you? Also how does this affect NXT 1.0 system? It seems to be one of the first blockchain to implement a child-chain technology with Proof of Stake mining?

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