Microsoft Office 365 & Microsoft Office 2013 is now available (as of 30th January 2013)! you can get it from your favourite computer stores or online directly from Microsoft Store Singapore Online Store.
If you have bought the previous version of Microsoft office between 19th October 2012 to 30th April 2013, you are entitled to a free upgrade, just go to office.com/offer to redeem your copy of Microsoft Office 365 or Office 2013. The redemption period is between 29th January 2013 and 31st May 2013.