Are these statements true?
If/when there's a relaunch, we keep the coins we had prior to the block where it's getting forked.
We keep the same wallet address (though no doubt a wallet upgrade will be required).
Both true.
If you sent coins after the fork, anyone can grab the transaction from the old blockchain and broadcast it to the new network though. (They can't change the recipient however.)
If you want to "reverse" transactions made on the old blockchain after the fork, you should send all your coins to a new address as soon as the new network is up.