Exactly, MS should fix HTML5 bugs in IE11. IE12 will be Win10-only (at least it won't run in Win7 as the normal support ends very soon) If the rumours are true

Exactly, MS should fix HTML5 bugs in IE11. IE12 will be Win10-only (at least it won't run in Win7 as the normal support ends very soon) If the rumours are true, IE12 will come without the IE compatibility modes (IE7-10). And IE11 will ship as legacy browser next to IE11 for corporate users. So fixing the bugs in IE11 is even more important.