Fact One: Falcons don't mind an ion token here and there, but they hate actually being ionized in the middle of a maneuver. Walking a Large ship off the board with ions can be difficult to do, but walking one into an uncomfortable position vis-a-vis giant space rocks is far easier and nearly as amusing. Ionization also effectively shuts down Push the Limit and Expert Handling, both of which are far from unheard-of as Falcon upgrades.
Fact Two: Phantoms hate ions, because an ionized Phantom can't decloak. Phantoms also aren't big turret fans.
What do you get when you add those things together? You get a trick that is going to frustrate the bejeezus out of both of the metagame elements people are most concerned about right now. A pair of Gold Squadron Pilots with just Ion Cannon Turrets and focus tokens have a 60% chance to ionize a Phantom, and a 70% chance to ionize a Falcon (assuming the teeth of Threepio + evade have already been pulled by a higher-PS ally). Those are good odds from where I sit.
And even if you don't get the chance to attack a crafty Range 3 Phantom or Falcon with your turrets, that means you're practicing area denial; a Range 1-2 bubble stretches across half of the board, and you're packing two of them. That's a nice way to limit where that Phantom can land even if he never takes a single attack.
I think it works better in a four-ship list, but there are some new tricks in the world for three-ship lists, too, and I'm curious if that would work out. So, without further fanfare or commentary, here are two lists I think might be able to take advantage of board control to beat the current metagame.
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"Dutch" Vander (23)
Ion Cannon Turret (5)
R5 Astromech (1)
Roark Garnet (19)
Ion Cannon Turret (5)
Tarn Mison (23)
R7 Astromech (2)
Blue Squadron Pilot (22)
Total: 100
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"Dutch" Vander (23)
Ion Cannon Turret (5)
R7-T1 (3)
Luke Skywalker (28)
Predator (3)
R5-P9 (3)
Kyle Katarn (21)
Predator (3)
Ion Cannon Turret (5)
Recon Specialist (3)
Moldy Crow (3)
Total: 100