I'm concerned about the cooldown between shield drops. This concern stems from the poor balance in Halo Reach where the cooldown between dropping Bubble Shields started at the time you dropped the shield and not when it dissipated allowing one to sometimes be able to drop a shield right after the previous one pops. This led to spamming shields on objectives and was one of the reasons for my quiting that game rather early (~3 months compared to 3 years for Halo 3).
I do hope that the cooldown for deploying another shield starts when the previous shield dissipates whether that be from a natural timeout or popped from damage. Hughes did state that only one shield can exist per player at any given time so that's good.
Also, EMPs... I can see this getting annoying if there's a short cooldown between uses on a Mark III.
As always, we can only wait and see...
Edit (random thought): As Hobo has voiced concern over the set number of items per life rewarding death to get those items back, how about an overall cooldown between lives for using items_
Example: Enter battle with EMP Mark III. I use the first of my EMPs and then die. I respawn and have 2 left with the first on a cooldown timer for use in this life. I last long enough in this life to use the other 2. While those 2 are on cooldown for the next life the first completes its cooldown and is ready to use again for this life's third EMP use. I die and respawn without any EMPs because they are still on cooldown but will be able to use all 3 this life each once they have cooled down fully.
This preserves the count per life but also prevents rewarding death with a full compliment of items every time.
Edited by Greenvalv, January 23 2014 - 08:25 AM.