It's not like we didn't know it was coming, but Microsoft are working on both Windows 9 and Internet Explorer 11. The news comes from MSFTKitchen, who posted a link to a Microsoft job post, which is looking for a "Software Development Engineer-BING."
The job post mentions Windows 9 and Internet Explorer 11, stating:
The team will be constantly delivering great products in areas including Windows 9, IE11 services integration, touch friendly devices including iPad and more.
This isn't Windows Blue, either, as that is a separate update to Windows 8 that is coming later in the year. This is the true, next-generation OS from Microsoft. Something I that I think will wrap their worlds together with Surface, Xbox, and more.