although we still don't know when these changes are going to come.
Actually, we do. Did you miss their latest announcements on the Lodestone? These changes are slated for late Nov - mid Dec. But yes, definitely very exciting.
Personally, I think the Market Ward search will have a major impact on how players SELL
their items. Once we're all accustomed to going into the particular ward we need (based on the item we're buying) we'll just plug in the item we're looking for, and the retainers selling them will somehow be marked according to SE. Why is this such a big change for selling? Because if we're not going into wards and randomly clicking every single retainer within eyesight, we're much
less likely to be buying all that other misc. crap people sell with no rhyme or reason.
Thus (I sincerely hope) forcing people to start selling their items in the appropriate Ward. This will of course become easier with the addition of the ability to purchase more retainers. Personally I plan on buying two right off the bat. I was a mule junkie in XI and I see myself relapsing soon.