I can see three, even four systems, depending on the opposition and whether it's home or away.
Watching the friendlies doesn't give much away because we're clearly avoiding any set plays, corner routines, etc.
It does seem players have appeared in strange positions, such as Diarra at Hearts, so we could see some tactics purely suited to a particular game.
You'd think we'd have a different set up depending on whether it's Liverpool away or Wolves at home so I think we'll be in for a few surprises.