IIRC there was an error in the Hysteroi pezhetairoi armour value, making it somewhat less effictive than it should be. The correct armour value is 12. They are are only available to Macedon.

Of Carthage's reform...does the EB team intend to do the same thing (using vanilla Marian triggers and all) for certain high-end Carthaginian units like the "Hannibal" ones (African infantry et al)? It's quite curious that Carthaginian Polybian-like troops would run around hunting down the poor Romans stuck in the Camillan military era still (though I like it, poetic justice ha!).
IIRC the team planned to include a Carthaginian reform, but I am not entirely sure. A similar reform would make Hysteroi pezhetairoi and thorakitai argyraspidai available.