ammo system sounds like it will be a nerf on the patch that was supposed to buff. I guess we'll see. They shouldnt need to be "careful" buffing Heimer given how far down the uber list he is.....
if we understand that correctly,if it's an ammo system,it works like teemo shrooms,means cdr affects on how much time turrets gets stored.
go gank top,place 2 turrets in 3 secs behind them,turn on your ult,fire 5 rockets( way better now since you will most likely hit the 3 caster/melee minions and the person you're ganking, stun him with 1000 grenade speed,turrets finish him.
and since his ultimate gives 20% cdr,9% from masteries,10% from elixir,I can see it working pretty nicely,even in small skrimishes dropping 2 turrets and beating the **** out of them if they choose to hit you.( new AI )