Just noticed this online tonight:
Details here.
Use the free SPG App for iPhone®, iPad® and Android™ to book your next stay or just to save your reservation details and you will be awarded with 500 bonus Starpoints® per stay. Simply display your stay information or reservation number through one of the SPG Apps at check-in time. Offer valid until 31 December 2014 at participating hotels and resorts in Australia, New Caledonia and Fiji only.
Details here.