Why the new icon?

Because of the SteamOS?

I dont see any change

I dunno, I use a custom icon

Click

that one

Because Steams got blue balls obviously.

Wow, this changes my whole life.

Don't see any new icon, but I did notice Steam changed it's color scheme to include some dark blue.
It's not bad I guess, but IMHO, they should stop waste their time on useless features and look into some more... important issues, like the Greenlight shenanigans and such...

I like the new one. :)

HL3 confirmed!

I guess it for it to look more like SteamOS logo. And macarons.

Because of shininess, blueness and circularity.

I like the new icon, but god... I hate the new UI.

Circle is the new Square

Why not?

I personally prefer the new icon :D

Gotta restart Steam without my custom skin though to see this new "blue interface" people keep mentioning...

EDIT: Aaaaaaaaand I like that more too, but still sticking with Air :)