If you will have a current subscription at the launch of F2P but do not yet have your Collectors Edition you will get all of the Coin Rewards apart from the 1000 Coins for having a Collectors Edition.
Please see the chart on this page which shows the various rewards.
You can also log into your account and click on 'Cartel Coins' to see how many you will receive at the launch of F2P.
Thank you for playing Star Wars: The Old Republic
However, if I apply a collectors edition key AFTER f2p launches, will I get my 1000 coins?