Yes...divisions don't matter anymore.
Wildcard 2 plays at Wildcard 1.
The winner plays the team with the best record in the league.
The other two teams play each other.
Right now St. Louis would play Atlanta, with the winner playing the Reds. The Giants would play the Nationals.
Also different this year, and just this year, is the format of the first round.
The Wild Card one game playoff winners, will play two games at home, and then play three games at the 1 seed.
The 3 seed will play two games at home, and then play three games at the 2 seed.
So the disadvantage of being the 1 or 2 seed this year, is that you have to play the first two games on the road. Whereas, before you would play the first two at home, and then game five at home. Obviously, if you end up winning one of those first two games, you seem to be in a great position.