That seems to be coming along nicely but it looks like almost nothing made it into IE11 - so doesn't that mean we missed the boat for a few more years? I want to use this stuff so badly already. Gah.
Well since IE11 shipped already with Windows 8.1, no.
I don't expect Microsoft to follow Google and Mozilla with their 6-week release cadence. If they keep to their yearly releases, we will see new features integrated into IE much faster than ever before. As a web developer, I can live with 1 year or less of waiting when specs are finalized.
The real problem is Windows XP has been abandoned so those users cannot upgrade past IE8. They must either upgrade their systems or switch to another browser.