After MS Office 2007, Office 14 is still getting built up. Alpha testers have received this official build and here are some Office 14 alpha screenshots. As per the screenshots, the ribbon looks same as it was in Microsoft Office 2007.

Microsoft is planning to release in 2009 so Alpha testers  says- Office 14 should be named as Office 2009. More likely, it is expected at the year end of 2009 or early 2010.

MS Office 14 Excel

MS Office 14 About

MS office 14 Word

MS Office office Word (about)