Yes, Microsoft is developing Office for 20 years now.And I don't buy the argument that Apple has any imperative to make iWork as a full featured product equivalent to Office. Microsoft has been producing Office for over 20 years they can bloody well make a package that's as close as possible between to platforms.
http://blogs.office.com/2015/05/04/office-2016-public-preview-now-available/?WT.mc_id=SOC_FB_2016Preview_blog&Ocid=Excel_Social_FBPAGE_Microsoft Excel - microsoftexcel_20150603_188274071
What I don't understand is why Apple still doesn't have its own fully-featured office suite. How Apple wants to keep its own computer platform relying on an office suite produced by its main competitor?
iWork was initially launched in 2005, 10 years ago. Before that, Apple had AppleWorks, which dates back from 1985, 30 years ago, and which Apple choose to discontinue twice. Apple could have 30 years of office code right now, but it keeps choosing to discontinue its office suites to begin again from scratch over and over again. Apple's own office suite, being AppleWorks or iWork, could compete head-to-head with Office for Windows should Apple had wanted it to. However, instead of that, Apple changes the interface, removes features, makes everything simpler and easier, whenever it does not choose to discontinue the suite and begin with a new one. If you want something more complex done, you have to turn to Microsoft Office.