So in october youll get ardor, and in Q3 you get the new FNX token.
both based on average holding of NXT?
Only the ARDR token is distributed this way (you get the average of the holdings between July and October). The reason is that ARDR is relevant for security for Nxt 2.0. It was decided to choose a distribution form which should reward mostly those who are forging - long-term holders. So they can continue forging in NXT 2.0 without having to buy coins again.
But you don't have to forge to receive ARDR assets. What you should do is hold them in a real NXT account, not on an exchange, as "NXT" on exchanges are simply IOUs and it depends on the "good will" of the exchange if they distribute ARDR or not.
The FNX distribution (the first and most important child chain, the final name has still to be decided) will be based on a single snapshot in 2017. If you have NXT on this block, you receive FNX - if you don't have, you don't receive nothing. Very simple actually.