The article you cite is from October, which I assume means it compares the 4S to Android 3.x. Judging by the screenshots, its also on a non-Nexus phone, for what its worth.
The voice command functions and interface were completely overhauled in Ice Cream Sandwich.
Where do you see that? I saw that Google's speech-to-text now updates the text inline, definitely a nice feature, but no changes to the voice actions (it still operates on static, specific commands) or anything in the ballpark of Siri's interface.
The voice command functions and interface were completely overhauled in Ice Cream Sandwich.