Bo9s stances were things like:
• +1d6 melee damage, -2 AC
• +5 feet reach, on your turn only
• Walk on Air as long as 1 hand is free (supernatural ability)
• Gain attacks of opportunity against any opponent adjacent that moves, including 5 foot step.
• Gain the ability to use an extra counter maneuver every round.
• Get Blindsight 30' and +5 listen checks
• Gain a flight speed as long as your 10 feet within the ground, and inflict +3d6 fire damage if doing a full attack (supernatural)
• +10 to resist bullrushes, trips and the like, damage reduction 2/- and make squares you threaten have a -10 penalty to tumble through if you don't move more than 5 feet
• Damage reduction 5/-
• Move 5 feet as a free action with every successful melee attack, up to your speed
• Inflict 5 points of fire damage to any adjacent opponent who hits you (supernatural)
• Gain +2 dodge AC against a single opponent for every melee attack from that opponent that misses you.
Some of them could appear in 4e, in fact one of them already is a class feature of the Fighter class. But some of them are perhaps too complicated to be used in 4e again.