He's talking about the four preset audibles for each formation (in addition to the five customizable ones we've always had) that they added this year. For ps2, you call them by hitting the audible button and then pushing the right stick left, right, up or down. I imagine it works pretty much the same way on xbox as well.
If you play as the same team a lot, it's a good idea to spend some time in practice mode just going through the formations and seeing what the preset audibles are.