looks like its possible to get them now; i didnt anyway http://www.perthmint.com.au/catalogue/baby-dragon-2012-halfoz-silver-proof-coin.aspx Uhmm next year Release for 100yrs Titanic annivesary looks cool New Coin Releases available from Tuesday 3 January 2012: H.M. Queen Elizabeth II Diamond Jubilee 2012 1/4oz Gold Proof Coin Australian Lunar Series II 2012 Year of the Dragon 1/20oz Gold Coloured Edition 2012 Year of the Dragon Stamp and Coin Cover Famous Battles in Australian History Kapyong 2012 1oz Silver Proof Coin 100th Anniversary of The Titanic 2012 1oz Silver Proof Coin 2012 Australian Koala 1oz Gilded Edition 2012 Australian Koala 1/10oz Silver Coin
All depends how much they mint of the titanic coin, although low mintage doesn't always mean high premium it helps. I pretty much only consider numismatics under 5k only.
yes i am also very interested in the titanic proof, if there is any news on the mintage before the release, please share..