The first thing you'll notice when jumping into this game is that there are health packs. Yes, you can actually make a nice run at getting tons of kills and make up for the occasional lapse with health packs. Enemies will randomly drop a few things. They almost always drop their weapon, which you can grab to replace yours if you run out of bullets. They sometimes drop health packs, and even rarer they'll drop power-ups that allow you to call in artillery or an attack chopper. These power-ups are powerful for a couple reasons. One, they do massive damage. The artillery can really pound a side, and the helicopter flies all over the map automatically attacking the other side. The helicopter can be shot down if someone grabs some rockets though. Two, the player who calls them in gets credit for the kills. A helicopter who gets on a run could easily add a dozen to your kill record. These can be called tons of times each round by both teams.
The guns seem fairly standard and deteriorates over time. So you'll need to repair them as you go. Repairs don't seem overly expensive. Some guns can't be repaired. On your inventory screen you'll see them as the guns that have some extra text on their boxes. You can "win" guns and other bonuses as part of a post round lottery. I'm not sure exactly how it works, but after each round, 2 spinners come up and various prizes and things can be won. I've received a gun, bonuses to XP, money, etc. I'm still investigating the full system of how everything works. I tried to change my default gun and I can't seem to use my grenade anymore in game. I'm sure there is a good reason for that.
Finally the other major change I noticed is that there is no set base in this game. Both teams will start at a fixed location but if your base is invaded by the other team who camps it, your spawn will change to another empty location on the map. The map I played several times seemed to have 4 major spawn points. I don't know what happens if the other team spreads out in those locations. I've never seen a side try it. This is interesting, but also a little chaotic. You're advancing on an enemy and suddenly they are popping up behind you. There are also fixed gun emplacements around the map. These work on a heat system. Heat goes up quickly then you've got to give it a break. Short infrequent bursts are the best way to use it. An incoming horde actually won't take a lot of damage from it as you'll quickly overheat and it takes awhile to cool down. You can also pick up a flamethrower as an extra on map weapon instead of a rocket launcher. This is a pretty quick kill weapon. There is also partially regenerating health. If you take massive damage but survive, your health will regenerate to 50%. Beyond that you'll need medkits to heal. Each one is good for 25%.
I think I'll stick with this for right now. Get a few more hours in and investigate the system a little more. Warcry is still on hold, as is Born to fire. I shot as mall gameplay video in which you can see the fixed emplacement and a bit of a go against bots. The bots aren't entirely pushovers in this, much like the bots in Sting.