Poor Internet Explorer. Slow performance, poor security, and the butt of jokes and memes for over a decade.
Its feelings obviously hurt, there will be no Internet Explorer 12 to accompany Windows 10 next year. Microsoft is officially retiring the browser and replacing it with a new, improved model, codenamed Spartan. As its name suggests, Spartan will be a lightweight, stripped down browser, in the same vein as Chrome, Firefox, or Opera Next. Spartan will be available for both desktop and mobile devices, though Windows 10 will ship with Internet Explorer 11, for compatibility reasons.
Though no release date has been announced, further news is rumoured to be revealed on 21st January, 2015.