4-1-3-2 is one of my favorite formations. As long as the Crew have some pace to push down the wings, they will be able to score in this formation.
Higuain will play at the CM, but don't be too surprised to see him playing further forward and allowing Trapp the job of cleaning up the defensive midfield.
I would love for Parkhurst to be either the LB or RB for this squad. Everywhere I've seen him has him listed as a RB, not sure if he'd do well at LB, but it will most likely be huge step forward from Chad Barson and Tyson Wahl last year. I think this also gives Josh Williams the chance to move inside and be our #1 CB.
I've also heard there may still be a marquee transfer from the Crew sometime this season. I would [Mark May] myself if they stole Diskerud away from Rosenborg. But that's wishful thinking.