To me, New Atheism is a combination of the following: the increased media presence of a certain crop of atheist spokespersons (especially Dawkins and Hitchens, Harris and Dennett to a smaller extent), a newly found unapologetic display of one's atheism, and a habitual reference to and reverence towards an idealized concept of "science" as the remedy against the oppression dealt out by religion.
The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition