I'm mostly excited about Ice Breaker because of how it will affect my PvE playstyle. Sniper rifles are so situational and they give you so little ammo for them, that I basically never take one with me as my default special in to mission. I am much more likely to need a fusion rifle or maybe a shotgun when shields start to come in to play and shit hits the fan up close since. And switching weapons depletes SO much ammo that you might as well not unless there's ammo already lying around*. Sure you can use ammo consumables, but I only keep maybe 4 or 5 on me at any time because I'm not making nearly as much glimmer as some of you (Really don't know how some of you are hitting the cap so easy). Plus the cooldown is so long that I'm out long before I can use the next one. So basically, with regenerating ammo, I can se myself using a sniper rifle a lot more often whereas before, I would have just tried to slowly pick things off with my scout rifle or something.
* Can we talk about how dumb this is? I understand it for PvP, but in PvE switching specials and heavy weapons should give you the same percentage of ammo for the weapon you're switching to. I don't understand the logic in this decision. Especially when they mix and match so many shield types. I'm really curious if they just really don't want you to switch from your primary loadout.