Microsoft has been rumored for a number of years to be bringing its Office productivity suite to the iPad, and according to a new report from ZDNet, it is coming "sooner than most think." Sources have indicated to ZDNet's Mary Jo Foley that Office for iPad may even arrive before the "touch first" Windows version that had been reported to be leading the way.But I hear Ballmer and the senior leaders of the company may have had a change of heart towards the end of last year. According to one of my contacts, Ballmer OK'd the suggestion by the Office team that they'd bring Office for iPad to market as soon as it was ready, even though that would likely mean before the Windows 8 version. I'm hearing that new date for Office for iPad is