I think the goal is auto fill top vs auto fill top, etc. I know they mentioned having equal number of autofilled players on each team, so my guess is this means they'll try to match position of autofilled on each.
This is pretty much where we're looking. We're being cautious with how fast we tune the autofill knobs, because there are some pretty clear trade-offs in match quality and matchmaking queue times if we go too big too fast.