I feel like the "attacker may not deploy units with models with Tough(X)" is going to be pretty rough on some factions. That means you need 4 units without attached heroes or weapons teams and generally non-Tough. Especially armies that make heavy use of weapon teams (like HDF or Ratmen) or has many mainline units with Tough (like Alien Hives) really need to build their army around this restriction. (And they'd better have read ahead, because the army building restrictions don't mention this)
How is "raise the alarm" meant to work? It says you can do it "instead of attacking", but does that need a melee units needs to declare a charge, run to an enemy, and then just get mauled? Or was it just meant to be "you can't attack this activation", but you don't actually need to get in range of anyone to do so?
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The no tough rule was a lil hard to fight because of what you said a lot of factions will be hard here. As the attacker you get several advantages you will be able to pick enemy units off if you can manage to break them in one attack. Raise the alarm works in that you may take any action Hold, Rush, Advance even Charge( although that would not be recommended) and instead of shooting or melee attacks you may raise the alarm (spend time calling in the attack). Stipulations is that they need to have taken a wound this round or they are within 9" of a enemy.