Well, I heard somebody say there were no chests in 2e (don't know how official that is, mind you.) It's entirely possible that relics are the only items heroes find "in the field" and the rest are just bought in town after the heroes save up enough cash. More powerful weapons being more expensive, natch.
It's also possible that all the non-relic weapons are roughly the same in terms of power and the heroes improve their combat potential primarily through their class deck and the abilities it provides. There do seem to be a fair number of skills that say "make an attack with X bonus applied."
I do hope there's some mechanic for looting treasure in the field, however, if treasure is "leveled" like it was in 1e, I sincerely hope the tier system is more granular than just "copper/silver/gold." With weapons and armor falling into "crap, moderate and god-powerful" the power curve was a bit wonky in the old system. If there were more tiers the power levels could be more evenly distributed.
We know the campaign is divided into Act I and Act II, so perhaps there are "Act I" gear cards and "Act II" gear cards. That would be going in the wrong direction for my hopes, though. There also hasn't been any obvious sign of the weapons they've shown us being divided like that.