So nothing really is going on, so I thought I might describe Keefe's system in a very simplistic manner to anyone who doesn't watch the Marlies. I believe even if the record is solid, Dubas won't be afraid to fire Babcock if he believes they won't get past the 1st round, and he isn't happy with the play of the team.
Neutral zone
As the opposing player is surveying the options behind his net, F1 for the Marlies stands in front of the net, waiting for the player with the puck to make a play. F2 is at the centre ice line, while F3 is at his blueline.
Opposing player carrying puck out the zone
One forward chases the puck carrier. F2 stands inside the blueline tracking the puck carrier, while F3is near the centre ice line tracking the play. He then chases the player with the puck who is attacking the Marlies blueline.
Analysis
This type of alignment gives them aggressiveness, but also a solid safety net with the other forwards. It seems the Marlies play zone defence in the neutral zone.
Defensive zone
With the puck in the corners, the wingers are usually positioned near the top middle of the circles.
Analysis
I like this. It is much easier to cover the points if the puck gets there.
Powerplay
The Marlies runs through Bracco mostly, but it's not their only strategy. They use the points very well, and the group is constantly moving.
Penalty Kill
The Marlies have a very aggressive penalty kill and they force teams to make quick decisions.
This is pretty much what I have, but a few months ago, Scott Wheeler wrote a detailed piece on the differences between Keefe's system and Babcock's system.