As who expected? It was stated quite some time ago that using DirectX 12 to micro-manage resource would require additional work, which makes perfect sense really...

Since DirectX 12 is supposed to be a lower level API it obviously will take more time to optimize. I don't know why anyone would think otherwise.

They've scheduled the DX12 release for 2015 fall... which is understandable considering the amount of time it'll take to roll out compatibility checks and solid drivers for the initial release.

I haven't seen confirmation, but its fun to speculate that;

If Halo 5 is scheduled to be released in 2015 fall and DX12 is currently being implemented.. it would indicate that the API is already developed and implemented for the Halo 5 beta this fall.

In that instance, they would just be using this year to check compatibility issues across PCs. If it is ready and solid, we may even see Console dev's getting there hands on the API prior to the cross platform release date.

CPU' parallelism will change this generation awesomely

Or for a more apt comparison, the same could be said for Mantle, and for the "to the metal" APIs on the console.

Micro-managing resource requires effort, it just comes with the territory.

Agree!!