From the information I have, a level 1 wizard gets 4 cantrips, 2 at-wills, 1 encounter, and your choice of 1 of 2 daily powers. You also gets 3 rituals, right off the bat, no paying involved.
So, abbreviated, it looks like: 4/2/1/1(2) + 3 rituals for a total of 12 unique known spells...