I heard somewhere that they were trying to reach NPC eye player tracking/face capture kind of technologies blend. Not sure IIRC but it was something like that.
I looked at the page more thoroughly and came up to unfortunate conclusions, unfortunate even for myself...
Here they go...
...
Every time I see menu get soaped - I want to kill one Valve employee.
Every time I see chat window get scrolled - I want to kill another Valve employee.
Every time I...
A lot of good improvements, but UI is too god damn sterile.
Main screen soaping... Heroes look like some sort of beauty models on podium with direct lights upon them. Whole mentality is damaged. Blizzard smokes hexagon crystals in the corner.