Noticed significant changes in early to mid game loot, there was a major lack of guns and ammo on the coast and moving in land very slowly adds extra guns, I was leaving spawn towns after significant looting with maybe 2 pistols with a mag each and minimal ammo, I would rarely if ever have any kind of rifle or shotgun and if I did it would have almost no ammo.
Moving into the "mid game" progression I was able to find some shotguns and break action rifles in houses, Police stations were a good hit as I could find SSG rifles and pump shotguns, I was able to find stab vests from police zombies but I was lucky to find 1, not finding any sometimes on 5/6 police zombies. At this point as well I was finding it VERY hard to find food, I only survived from finding apples and pears off trees, without those I would have starved. This made hunting much more necessary, helping with the "survival game" part of DayZ!
When I started to get into NWAF area I was able to find SMG's like the MP5 and UMP but the mags were very hard to find, meaning I was running an MP5 with a single 30 round mag and an SSG rifle. This is fine but by the time I would expect to find more mags I was already going to Tisy and finding better guns that I would swap for the MP5.
I was unable to really find any convoys or heli crashes on the way, I didn't hear a single heli crash the whole time, I did find one that was unlooted with zombies up, weird that I never heard it land.
After going to Tisy we were able to find AK101 and some DMR but again with very minimal mags spawning, I don't know why the DMR would be spawning in T4 and not dynamic but the lack of mags is quite interesting, it gives a reason to come back or keep looting elsewhere to find the mags for the high end guns.
Generally its been very interesting, the progression is much slower early and makes it harder to rush into a fight if you only have 2 spare rounds. I would say the progression into finding SMG's is okay but you find much better weapons shortly afterwards which makes them mostly pointless.
One issue we noticed was that there was a significant increase in Plate zombie spawns, we were finding 4 or 5 zombies in each military that had plates, making them much too easy to find.