*) Supression (think COH) is in the game in addition to the existing morale factor.
*) Squad sargeants are persistent in the single player campaign and gain levels and attribute points, which can be spent on various attributes to unlock special skills. (frag's note: don't be suprised when this is in the multiplayer game too, Relic has basically telegraphed from the beginning that they are going to be going for a lot of persistent elements in DOW2 multiplayer.)
*) "To balance that out, it's also possible to cause enemies to flee if they feel outnumbered, indicated by a large exclamation point appearing over their heads." - CoH style retreats are apparently in.
*) Cover system works apparently a lot like COH-mouse over to find the areas of best cover for your troops.
*) Squad leaders do not die, they flop over when out of health and can be revived by getting another leader near to bring them back to life (sounds a lot like the AOE3 explorer recovery, which works fine).
*) Squads will reinforce either from drop pods (once per mission, presumably only from SM) or, and here is the BIG news-from shrines, which sounds like relic points on map, this time defended by enemies (and will likely be contested in single player).
*) At least in the single player game (and you know this is going into multiplayer as well, Relic is just being a tease), you'll fight extra difficult mobs at the end of missions, and they will drop freaking LOOT (apparently complete with rarities! OMG grind an RTS for loot!) to equip your squad with.