They have already started the coin swap for 'preferred holders', but from March 1st, they are doing a 1000-1 swap, so if you hold 500,000 old coins, you will receive 500 of the new coins. All the details are available on their website, so if you are holding coins on an exchange, you should transfer them to the old pac coin wallet (downloadable from the website). Download the new wallet compatible with the new Pac Coin ready for the distribution. Then from 1st March, send your coins to the contract address provided on the website and they will send out the new coins to your new wallet. Check the website for full details (www.paccoin.net), but don't wait to do the swap as over the next few months, the rate deteriorates and you will receive less coins in exchange.