Okay, after some screwing around in higher level areas (i am a 29 paladin), those were the itens I got
I can't say for sure, but I think most of the items I got were from chests and rare mobs. Those might not be able to drop scaled itens as it seems.
The scaled items have only scaled for less than its normal level and seem to have no relation with my class, spec or level (29).
I also noticed the rare items' effects (bleed and fireball) damage were a bit higher than stated on wowhead. It might be a error on the site's tooltip, own Wow tooltip or a show that their damage are someway scalling based on level or stats.
I have not done tests with a level 60 - 110 friend to see if I could get some drop in the very higher level areas (40-60), but based on previous test I couldn't get any loot there, even from rares (100% chance do drop something).