so if I trade my nxt coins...then I have no nxt anymore?
Just in case other replies haven't addressed this for you, and to sum things up for late arrivals (please correct me if something is not accurate)
1) Starting july 14, hourly snapshots of NXT balance will be taken for all Nxt network accounts. This will last for three months. At Nxt network block 1,000,000 (due for October 12th) every Nxt account will receive an amount of Ardor assets equal to the average of all the snapshots taken. Your account still keeps the NXT you are holding at that block, as usual. And from that moment, Ardor assets become tradable in the Nxt asset exchange.
2) When Ardor network goes online next year, the ARDR tokens for the main chain will be distributed according to the number of Ardor assets held in each Nxt account at the moment of launch. This main chain and the ARDR tokens are the backbone securing the whole network including all child chains transactions.
3) At the same time of launch, tokens for the first Ardor child chain (the transactional token, name to be determined but so far referred to as "FNX" in discussions) will also be distributed to each account. The ratio will be 0.5 "FNX" for each NXT in the Nxt account balance at the time of Ardor launch. The other half of these first child chain tokens are held for platform development and funding.
4) The Nxt (1.0) network goes on as it is. So the amount of NXT held in every Nxt account are still there with the Nxt 1.0 features after Ardor (Nxt 2.0) has launched.
In short,
1 NXT >>> 1 ARDR + 0.5 "FNX" + 1 NXT