Hopefully they will break the market down into select merchants.
You'll have the bog standard merchant who will buy basic items off you (or non-magical non-unique non-artifact items) for a low cost (lets be honest, they wont sell the hordes of swords you stumble across, so why should they buy them at a high rate?)
The really expensive items that you find at later levels could be sold to an exotic merchant (who you may have to unlock with a quest or two to gain his/her favour) who has considerably larger funds accessible to them. That said, the more items they buy off you of a similar type, the less they will give you money wise - supply and demand etc.
I'm hoping this kind of system is in play. That way the player still has a way to get cash, but they have to work for it, and have to explore different regions to get different high-level items from mobs, rather than camp a spawn spot and fast-travel to the nearest merchant to sell a multitude of the same items for a massive profit.
my $0.02
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