The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
@Tagada
The BrewLan Mod by Balthazar has the option to upgrade the Aeon T2 shield to the T3, including the animation for the upgrade. I'd love to see the T2 upgrade to T3 integrated into FAF, provided he's ok with it.