Items lower than 58 will not drop in inferno anymore.
Affixes roll on monster killed means that if you kill a lvl63 monster you also get ilvl63 stats even to 61ilvl model equip. (people in PTR have sayd that 1.05 necks with ilvl63 stats can roll upto 100% crit damage^^)
If you choose MP1 as difficulty, it doesnt matter what act you do. All acts roll same stuff.
In inferno with MP1 the only difference between items that drop of diff iLVLs will be the graphical model.
The base values should also still be different. An ilvl 63 Chest (Archon) should still roll higher base armor values than ilvl 58-62.
I'm not 100% sure on that though, haven't played the PTR.
Then by that logic, weapons of an ilvl60 or below will still have a lower base damage than the rest. Interesting
That is the way I understood it as well. i63 armor will still have more armor value than i61. However, they can roll the same max crit/resist/primary stat, etc.
This would've been a bigger deal for weapons, however, I think they allowed i61 weapons to roll i63 damage in a prior patch so I think it only effects armor?
Weapons still have lower base damage stats at lower ilvls, just like gear has lower base armor. Affixes are what make up the large majority of real weapon damage though so an ilvl61 weapon with 63 affixes could still be great. They buffed the 61/62 weapon damage affixes in 1.0.4 but the 63 affixes are still better, so this is still a buff.