So here's a capture from a league game.

Click image for larger version.  Name: Top Eleven Illegal Formation 80-20.jpg  Views: 82  Size: 56.6 KB  ID: 32019

That's my team on the right, with 80% possession and nary a winger in sight. On the left, my opponent has a "legal" formation and seven players out of position (two yellow, five red) -- only his GK, DL, and two of the three MCs are playing in the correct spots.

I'm going to assume that the "wingers" portion of the illegal formation rules is not operative right now. Next up: can I play a formation with no strikers? With nine guys on my half? If so, I'm sure going to be tempted to go 5-3DMC-2MC the next time I'm up one goal in a final.