Granted, we can only speculate at this point though the same question seems to come up over and over regarding this upcoming update: 'who goes first?'
Obviously I have no idea how the devs will end up (mis)handling this long-anticipated "many-eggs-in-this-basket" feature, but if it is not an automated stat calculator sim, with/without a random luck multiplier, my suggestion is this:
2 players enter and are randomly assigned as team A or B;
A goes first, B goes second;
HOWEVER, A enters blindly whereas B gets to see A's team and has 30 seconds to modify the team accordingly