IE 11 for Windows 7 is out.
IE 11 is the default for Windows 8.1.
I expect this to show up in Windows Update for Windows 7 but hasn’t yet.
Announcement: IE11 for Windows 7 Globally Available for Consumers and Businesses
Microsoft: Internet Explorer Page
IE 11 Welcome Page
Internet Explorer 11 for Windows 7 (32-bit)
Internet Explorer 11 for Windows 7 64-bit Edition and Windows Server 2008 R2 64-bit Edition
Internet Explorer 11 Language Packs for Windows 7 and Windows Server 2008 R2
Internet Explorer Administration Kit 11
Internet Explorer 11 for Windows 7